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Traummann
09-05-2015, 12:56
SLI sems to be broken in Project cars, this bug happens often with much rain.

for exemplar:
http://abload.de/img/pcars64_2015_05_09_02f7u43.jpg

from both my GPUs the usage drops under 50%, and my FPS goes from 60+ to 20+.
After a few seconds ( sometimes longer ) the fps going back to normal.
no overheating and no CPU limit.

This is a bug that should be fixed.
Because i can't play this game at all with rain.

this isn't happening with SLI disabled( always 99% usage and 40+ fps ).

in game graphic settings: everything on MAX. full-HD, this can be also repro with DSR 4k and aa off ( ingame )


GPU: SLI EVGA GTX980 ACX 2.0 - 350.12 WHQL
CPU: 3770k 4.0GHz
OS: Win7 64bit
RAM: 4x 4GB HyperX Beast
MB: GA-z77x-up4 TH

Jeremy Clarkson
09-05-2015, 18:56
I'm getting ridiculous frame rates because both GPUs aren't being fully utilised. Sometimes they will be at 93% usage, then more often than not they will drop as low as 50% usage and they won't go back up to full usage. This happens randomly, like if I crash it may drop the GPU usage in half.

There is no bottleneck in my system, I have 2 gtx 760's, 4770k and 8GB ram. I have lowered the settings so the vram is well below 2gb [to 1600mb in fact], so this rules out a vram bottleneck.

This isn't a temperature issue either because my system is fully liquid cooled, and temps never go above 50c.

I can play all other games and both GPUs work at their full potential.

Oh yeah, vsync is OFF and I have no frame limiter enabled.

I've tried disabling SLI and GPU1 works at 100% usage, which actually gives the same performance as SLI enabled when the usage is dropping.

Please fix this so I can enjoy this amazing game.

Aldo Zampatti
09-05-2015, 19:03
What's your CPU? probably you're limited on that front

Umer Ahmad
09-05-2015, 19:08
Can you post your Visuals menu settings like AA and stuff like that?

chaugi
09-05-2015, 19:31
What's your CPU? probably you're limited on that front
He already said 4770k = i7 - 4770k. It is powerful.
Project Cars uses a lot of CPU, it should be shifted more to GPU side. I have i3 - 3225 (it is more powerful than some of i5 CPUs), Project Cars is always using almost 100%, I don't have same problem with GTA 5!

Jeremy Clarkson
09-05-2015, 19:48
My CPU is i7 4770k.

http://s14.postimg.org/49nofbau9/image.jpg

http://s12.postimg.org/9e70f3jdp/image.jpg

Jeremy Clarkson
09-05-2015, 19:51
If I run Heaven 4.0, Assetto Corsa or any game infact, both GPUs are pinned at around 95% usage

Aldo Zampatti
09-05-2015, 19:52
He already said 4770k = i7 - 4770k. It is powerful.
Project Cars uses a lot of CPU, it should be shifted more to GPU side. I have i3 - 3225 (it is more powerful than some of i5 CPUs), Project Cars is always using almost 100%, I don't have same problem with GTA 5!

You're right, sorry, missread CPU INFO.
But regarding CPU utilization, remember that CPU isn't only used to render, is it used to calculate Car Physics at 600 times per second!!! (600hz) So it will play a major role in PCARS more than other titles such as GTA



My CPU is i7 4770k.
http://s12.postimg.org/9e70f3jdp/image.jpg

Please, as Umer asked, post your screen at Options&Help/Visual/PErformance

Jeremy Clarkson
09-05-2015, 19:58
I just posted my graphics settings above...

Please lets not get off topic here, this has nothing to do with my CPU, this is SLI related.

Jeremy Clarkson
09-05-2015, 20:01
This is what's happening to me with two 760s in SLI, apart from its not just in the rain it can happen any time.

N0body Of The Goat
09-05-2015, 20:03
I think "ultra" settings is a bit ambitious for SLI 760s!!!! ;)

Try a mixture a med/high, if good then try "high."

Aldo Zampatti
09-05-2015, 20:05
Can you try previous NV Driver?
347.somethin had an update PCARS profile, it might worth the shot reverting to those and re-try

Jeremy Clarkson
09-05-2015, 20:07
If thats so then how do I get above 60fps when the gpu usage actually works at 100%?

Jeremy Clarkson
09-05-2015, 20:08
This cards are more than powerful enough to run this on ultra, also note AA is off. The fact is the game isnt utilising the cards to their full potential. Confirmed by other users also.

Just for your information I have completely lowered the settings and this problem still persists.

Aldo Zampatti
09-05-2015, 20:20
I don't see your posted picture is seems, can you re-post please?

that aside, would you be kind enough to try 347.xx driver instead of 350?

thanks!

Jeremy Clarkson
09-05-2015, 20:21
Developers please look at how poor the GPU usage is....

As you can see the vram usage is well below my 2GB threshold for these cards, since I have AA turned OFF.

http://s27.postimg.org/n7hjhnkg3/image.jpg

Jeremy Clarkson
09-05-2015, 20:26
201015201016201017

MorciXL
09-05-2015, 20:26
In my case, Im using nvidia drivers 350.12 with SLI GTX 970 G1 Gaming and everything works fine!
Also im using 4xSGSS on Nvidia Inspector, and everything works great.

Tricky
09-05-2015, 20:31
Detailed Grass on ultra can cause some problems with SLI, when you tested on low settings did you lower that too?

Jeremy Clarkson
09-05-2015, 20:31
If you can't see the stats clear enough, it is showing GPU usage 53% and VRAM 1426MB

Jeremy Clarkson
09-05-2015, 20:33
Detailed Grass on ultra can cause some problems with SLI, when you tested on low settings did you lower that too?

I just tried with detailed grass OFF, and both GPU usage is exactly the same 53%

I'm now trying with 347.88 driver

Sankyo
09-05-2015, 20:37
Lower your graphics settings and see if that changes the max GPU load.

Jeremy Clarkson
09-05-2015, 20:41
Lower your graphics settings and see if that changes the max GPU load.

As I quoted on post #11 "Just for your information I have completely lowered the settings and this problem still persists. "

Jeremy Clarkson
09-05-2015, 20:59
Ive just changed every graphical setting to as low as they can go. I've also Changed the resolution down to 1440x900. Once again 50% GPU usage on both cards.

Look....

201028

Jeremy Clarkson
09-05-2015, 21:14
I've now tested 347.88 driver..... same story.............. I really do hope this gets fixed promptly.

Aldo Zampatti
09-05-2015, 22:42
I've now tested 347.88 driver..... same story.............. I really do hope this gets fixed promptly.

I'll investigate this further as it really sounds strange to me. I'll reply back here with whatever finding I get

Jeremy Clarkson
09-05-2015, 22:59
Great, I look forward to hearing back from you.

Aldo Zampatti
09-05-2015, 23:03
Have you tried this:

Originally Posted by MorciXL http://forum.projectcarsgame.com/images/buttons/viewpost-right.png (http://forum.projectcarsgame.com/showthread.php?p=891837#post891837) Dont know if this could help you, but i read it on Steam.

"problem solved
Nividia Panel -> PhysX - > CPU = 25fps 40% GPU
Nividia Panel -> PhysX - > Defult = 60fps 100% GPU"

EDIT: Nevermind, I've just read your post in the other thread :(

Umer Ahmad
09-05-2015, 23:08
As a test, disable SLI and tell us your utilization and fps for 1 card

Jeremy Clarkson
09-05-2015, 23:17
As a test, disable SLI and tell us your utilization and fps for 1 card

I'm sure I mentioned it earlier, but yea, with SLI disabled GPU1 works at 100%. FPS when SLI is disabled is pretty much the same as with SLI enabled (since they are working at 50-60%)

GhostInductee
09-05-2015, 23:32
Warning I have a very important one probably also interesting question that all can relate with a SLI system or could.

Anticipation to my system,

I own;

AMD FX 8350
GIGABYTE GTX 780 in SLI driver is currently 350.12
ASUS M599FX Pro 2
Corsair XMS 1600Mhz 8GB
Corsair h100i Watercooling
Corsair Carbide 330R Case
Corsair 850W PSU

To my questions,


Why do I have with my CPU only a maximum of 65% utilization?
And why do I have 70% occupancy at the GPU's and per GPU only 1700MB per graphics card ???? As I imagine it, the question whether the whole is really used ... because it is not over, after all I have for example. Per GPU still 1100MB air ?? Do you understand ???

Jeremy Clarkson
09-05-2015, 23:39
There appears to be a issue with SLI setups at the minute. My gtx 760s are under performing (50-65% usage) similar to your cards.

Traummann
09-05-2015, 23:49
This is what's happening to me with two 760s in SLI, apart from its not just in the rain it can happen any time.
true, but with rain is much more easier to repro


Can you try previous NV Driver?
347.somethin had an update PCARS profile, it might worth the shot reverting to those and re-try

350.12 WHQL have the same profile
however, same problem with 347.88

never had this problem with any other games yet.
This can't be also hardware related ( defective ), because if i test both GPUs alone i have 99% usage always.
I even tested with a different SLI bridge.

if no dev can't repro this i might test this with a different OS( win8.1, win10 ).

more info:
if this lag happens, my CPU usage does not change.
i also tested project cars on SSD, same problem.
after i do a screenshot with msi or steam, the fps and gpu usages going rapidly back to normal.

Jeremy Clarkson
10-05-2015, 14:58
Ok so I've got everything on ultra, and AA now set to DS4X rather than off, and GPU usage on both cards is now around 95% which is what they should be at. How does that work? With AA off and everything on low I get poorer frame rate?

201220

Mahjik
10-05-2015, 15:35
Ok so I've got everything on ultra, and AA now set to DS4X rather than off, and GPU usage on both cards is now around 95% which is what they should be at. How does that work? With AA off and everything on low I get poorer frame rate?


Just curious, when you did your Nvidia driver install, did you do a CLEAN install? I've seen when this is not used, the correct Project CARS SLI profile is not installed.

Jeremy Clarkson
10-05-2015, 16:06
Yes I always do. Select custom, then clean installation.

Aldo Zampatti
10-05-2015, 18:03
Yes I always do. Select custom, then clean installation.

Jeremy, would you be kind enough to do another couple of runs so we can report this properly?

1) I would like a complete graph from MSI Afterburner (showing GPU/CPU utilizantion and framerate) with the AA set to watever it was that failed to fill the GPU
2) Same run, same scenario with AA in DS4x as you tried last time.

Thanks in advance!

Jeremy Clarkson
10-05-2015, 19:44
These results are on Nuburgring Nordschleife, quick race weekend.

Ultra settings - AA OFF

201355
201356



Ultra settings - AA DS4X

201357
201358


Correct me if I'm wrong but GPU usage should be pinned at around 100% regardless if AA is enabled or not.

Jeremy Clarkson
10-05-2015, 19:52
Oh and btw Brands Hatchback GP is really really bad for GPU utilization, as seen on post #20 with all settings on low @ 900p

optik
10-05-2015, 21:10
if u want more gpu usage, let render the game 3 frames and aktivate aa and deaktivate HT.

Jeremy Clarkson
10-05-2015, 22:12
Why should I have to deactivate hyperthreading? The game should fully utilise my GPUs to their full potential no matter what graphics settings are enabled providing there is no bottleneck or fps cap - which there certainly isn't.

Jeremy Clarkson
10-05-2015, 22:17
Say I had a 144hz monitor, but didn't have the horsepower to run the game with AA, I could turn AA off, but then the game wouldn't utilise my cards to their full potential, thus causing a lower frame rate than what could be achieved.

There is something clearly not right, even when I lower everything to as low as can be and change the res to 900p both cards run at 50-60% usage. If there's nothing holding my cards back then why are they not being used to their full potential with this game only?

optik
10-05-2015, 22:25
than start learning how about config a game to make gpu or cpu high-priority.

and notice the eyes can only see 30fps and its not a shooter game.

Jeremy Clarkson
10-05-2015, 22:29
Take your comments elsewhere please, they are totally irrelevant.

Mahjik
10-05-2015, 22:36
There is something clearly not right, even when I lower everything to as low as can be and change the res to 900p both cards run at 50-60% usage. If there's nothing holding my cards back then why are they not being used to their full potential with this game only?

I'm not sure anyone here currently can answer your question. I personally haven't investigated what or how much of my cards are being utilized. If the performance is fine, I just drive. SMS does monitor this forum, so I'm sure if there is a problem they will take a look into it after they tackle some of the larger more showstopping issues for users.

Jeremy Clarkson
10-05-2015, 22:36
and notice the eyes can only see 30fps and its not a shooter game.

LMAO just shows how much you know....... I can very clearly distinguish the difference between 30 and 60 fps on racing games.

As I said above, your comments are irrelevant. See ya !

Jeremy Clarkson
10-05-2015, 22:38
@mahjik, there has been a few others having the same issue as me. I really do hope this issue gets resolved in a timely fashion.

Umer Ahmad
10-05-2015, 22:38
Whats the peak FPS u reached so far for SLI? And single card?

optik
10-05-2015, 22:38
i dont understand why u cry about gpu usage be happy that your gpus run at 50% 50fps, u dont need more,or u want 100% usage at 50 fps?
more gpu usage more power waste.

Jeremy Clarkson
10-05-2015, 22:41
@optik I want my GPUs working at 100% like all my other games so I can maintain more of a consistent frame rate. Just beat it kid, you have no idea.

More GPU usage = more consitant frames, less drops.... Do you not get it?????

Jeremy Clarkson
10-05-2015, 22:42
@Umar, Off the top of my head I can't tell you, but I will get back to you on that one.

optik
10-05-2015, 22:42
LMAO just shows how much you know....... I can very clearly distinguish the difference between 30 and 60 fps on racing games.

As I said above, your comments are irrelevant. See ya !

haha u not alone who can see the difference between 30 and 60fps.

Aldo Zampatti
11-05-2015, 00:26
i dont understand why u cry about gpu usage be happy that your gpus run at 50% 50fps, u dont need more,or u want 100% usage at 50 fps?
more gpu usage more power waste.

Relax guys.
Perception varies for human to human. I can clearly differentiate 30 to 60 to 120hz but for instance, I myself can not distinguish from 120 to 144hz (believe me I tried!)

So, for me personally, having a 120fps game experience is very importante, so jeremy is 100% correct on what he is trying to achieve

Umer Ahmad
11-05-2015, 00:47
Also, i'm assuming both cards are in the 8x/8x PCIe lanes and all bios settings are correct?

WMD: what was the rename trick? AFR-FriendlyD3D.exe? Does that still work?

Aldo Zampatti
11-05-2015, 01:01
Also, i'm assuming both cards are in the 8x/8x PCIe lanes and all bios settings are correct?

WMD: what was the rename trick? AFR-FriendlyD3D.exe? Does that still work?

EDIT: On a 2nd thought, if you can try as per UMER said, it would be useful.

Aldo Zampatti
11-05-2015, 01:11
One more thing, if after renaming STEAM say that .EXE wasn't found, please COPY your PCARS.exe or PCARS64.exe to AFR-FriendlyD3D.exe and execute that copied EXE

PerFixAlot
11-05-2015, 08:42
You should also check your Nvidia control panel settings.
I get 90%+ GPU utilization with these settings:

201429201430201431201432

I think the "Power management mode" can result in lower utilization if you have it set to adaptive.

Also, when I start recording videos I see a dip in GPU utilization, in 4K it even stays lower than normally, so maybe if you have ShadowPlay or something similar try to disable it.

Nvidia 3D Vision has also been known to cause odd issues in pCARS, if you have that installed it could help to remove it.

GhostInductee
11-05-2015, 08:54
You should also check your Nvidia control panel settings.
I get 90%+ GPU utilization with these settings:

201429201430201431201432

I think the "Power management mode" can result in lower utilization if you have it set to adaptive.

Also, when I start recording videos I see a dip in GPU utilization, in 4K it even stays lower than normally, so maybe if you have ShadowPlay or something similar try to disable it.

Nvidia 3D Vision has also been known to cause odd issues in pCARS, if you have that installed it could help to remove it.

Dude you have two GTX 980.....and the other Guy 2 GTX 760......you know what i mean?

GhostInductee
11-05-2015, 09:03
Hi, I have all tested again but I played SLI Disabled and with a GPU . Curiously, I have then a GPU load of 95 % but the same but the GPU memory FPS also located only 1500-1700MB .

I think there needs to NVIDIA and Slighty Mad Studios probably still working on it ...... here is the screenshots of the graphics settings unfortunately in German ...201437201438201439201440

eduardxw
11-05-2015, 10:16
I hope, Nvidia release soon a driver, or maybe a game patch
My graphic card is GTX 970 Asus / 1440p
Here is my settings ( stretched headlight reflections - NO )
I have about 46-48 fps, average

Unzen
11-05-2015, 10:32
Touch-wood, this game has ran superbly for me. If anything was likely to throw its toys out of the pram when running quad-SLi, I thought it would be this.

I can run some tests as well, if you want me to post some results?

Aldo Zampatti
11-05-2015, 12:27
Hi, I have all tested again but I played SLI Disabled and with a GPU . Curiously, I have then a GPU load of 95 % but the same but the GPU memory FPS also located only 1500-1700MB .

I think there needs to NVIDIA and Slighty Mad Studios probably still working on it ...... here is the screenshots of the graphics settings unfortunately in German ...201438

If JA means YES, then you're running VSYNC on, that shouldn't lead to a 100% utilization on any GPU all the time, only when below 60 fps.

Try disabling VSYNC, Disable SMAA, turn Render frames ahead=2 (1 is configured) and take it for a spin, please

Aldo Zampatti
11-05-2015, 12:29
I hope, Nvidia release soon a driver, or maybe a game patch
My graphic card is GTX 970 Asus / 1440p
Here is my settings ( stretched headlight reflections - NO )
I have about 46-48 fps, average

I would recommend you to lower down your settings a little bit as your resolution is big enough to almost get your 970 on it's knees :)

I would disable SMAA and enable AA=DS2M or DS4x for your system and also lower your reflections to LOW.
That should boot your experience IMO

Smikke
11-05-2015, 13:26
I hitted same problem as op (both GPU's run at about 50% load). My hardware is in my signature and I'm running 64bit win7.
I'm going to try fixes mentioned earlier in thread and report back later if any of those worked.

Traummann
11-05-2015, 14:30
also sometimes in the beginning of a race i have very low fps with very low GPU usage.

zoomer-fodder
11-05-2015, 14:31
Hello, im accept that problem. can somebody help me fix framerate drops with 4K DSR in Project CARS without alt+tab clicking?
allways before new load race i must clicking that, for 99% GPU LOAD. If i not clicking ALT+TAB i got 50% GPU Load.
3930 @ 4.7 HT
780 @ 1200/6600 SLI
16GB @ 2400 11-11-11-28 1T Quad:
350.12 WHQL
Some 4K benchmark on my system:
http://www.3dmark.com/fs/4220402
Sorry for bad english, im russian. Thanks.

PerFixAlot
11-05-2015, 14:33
Dude you have two GTX 980.....and the other Guy 2 GTX 760......you know what i mean?

Yes, I know what you mean. I didn't mean to copy everything, but to look for differences and try out the ones that make sense, like "Multi-display/Mixed-GPU acceleration", "Power management mode", "SLI-Rendering mode", see if anything stands out.

zoomer-fodder
11-05-2015, 14:36
ALT+TAB can help with 50% GPU SLI Load, but how make 99% without ALT+TAB?
on the previous page at the bottom more details

Traummann
11-05-2015, 14:57
you can also do a steam screenshot, than the gpu load goes back to normal

Jeremy Clarkson
11-05-2015, 15:17
I think your all missing the point here lads. Every single one of my games I don't need to tweak anything in the nvidia control panel, I just enable SLI and it works, both GPUs are pinned at around 100%, that's how it should be! I shouldn't need to alt-tab or alt-enter to increase my GPU usage, how conveniant is it to do that whilst in the middle of a race? That doesn't even work anyway, I've tried it. I also shouldn't need to enable a high amount of AA for my GPUs to work at 100%, they should be working to their full potential regardless if AA is on or not, since there is no bottleneck or no fps cap.

Aldo Zampatti
11-05-2015, 15:26
I think your all missing the point here lads. Every single one of my games I don't need to tweak anything in the nvidia control panel, I just enable SLI and it works, both GPUs are pinned at around 100%, that's how it should be! I shouldn't need to alt-tab or alt-enter to increase my GPU usage, how conveniant is it to do that whilst in the middle of a race? That doesn't even work anyway, I've tried it. I also shouldn't need to enable a high amount of AA for my GPUs to work at 100%, they should be working to their full potential regardless if AA is on or not, since there is no bottleneck or no fps cap.

That's indeed how it should be.

Jeremy, bear in mind that all the test I ask you to perform, are to let the Developers directly about the issue for a possible solution.

Were you able to try the COPY/RENAME of the EXE file

Jeremy Clarkson
11-05-2015, 15:28
Just as an example heres a photo of another game, with the settings on low.

As you can see both GPUs are working around 100% (91%+)

201539

Jeremy Clarkson
11-05-2015, 15:31
I haven't yet Aldo, I will give you an update later this evening once I have tried what you suggest.

Aldo Zampatti
11-05-2015, 15:39
I haven't yet Aldo, I will give you an update later this evening once I have tried what you suggest.

Thanks I do really appreciate it

Jeremy Clarkson
11-05-2015, 16:15
I've just tried renaming pCars64 to AFR-FriendlyD3D.exe and it says failed to start game (missing executable)

Aldo Zampatti
11-05-2015, 16:22
I've just tried renaming pCars64 to AFR-FriendlyD3D.exe and it says failed to start game (missing executable)

Yup, expected, that's why I suggested also to copy PCARS64.exe to AFR-FriendlyD3D.exe and double click on the latter. :)

Jeremy Clarkson
11-05-2015, 17:31
I've just spent the last hour doing some tests to give you a better idea.......

Funny enough AA doesn't seem to be the only culprit to this issue, since I was experiencing usage drops with SLI AA enabled on Nurburgring GP, but no drops with SLI disabled AA enabled.

For each of the results below, I done 2 laps of Nurburgring GP. This is not online, I'm on Solo Quick Race Weekend. The car is BMW M3 GT, there is 29 opponants on the track (same cars). Opponant strengh is on 80. Number of laps set to 3. Grid position random. Fixed weather Clear, time of day 8am, time progression 60x

For Graphics settings, everything is on Max. Vsync is off, Motion blur is off. Rendered frames ahead is on 1. Resolution is 1920x1080 60hz. The only thing that differs between the results below is AA and SLI

SLI DISABLED, AA OFF
GPU USAGE
201572
FPS
201573


SLI DISABLED, AA - DS4X
GPU USAGE
201574
FPS
201575


SLI ENABLED AA OFF
GPU USAGE
201576
FPS
201577



SLI ENABLED AA - DS4X
GPU USAGE
201578
FPS
201579


As you can see from the results with SLI ENABLED there is quite drastic GPU usage drops through out both with AA on and off. This happens particularly when racing along the straight of Nurburgring GP. But yet it doesn't happen when SLI is disabled. This gives me good reason to believe there is also something else effecting usage other than the AA bug.

Aldo Zampatti
11-05-2015, 17:41
Excellent tests.
I wonder if you can try AA to HIGH. On paper it has (give or take) same impact as DS4x but it's a completely different AA method

Jeremy Clarkson
11-05-2015, 17:53
SLI ENABLED AA HIGH
GPU USAGE
201580
FPS
201581

As you can see it's pretty much the same result as DS4X as you said. Usage is still spiking... but with SLI disabled there is no usage spikes at all. These SLI usage spikes are also apparent on Brands Hatchback GP, I've not really tested any other tracks. Nurburgring Nordschleife doesn't seem to be effected by SLI usage spikes when AA is on DSS4X, but is effected with SLI enabled and AA OFF.

Aldo Zampatti
11-05-2015, 18:08
I don't remember if we tested this few things:

1) -skipcrowds command launch option?
2) AFR-Friendly copying the EXE?
3) Turning off hyperthreading/shutting down 4 cores from Windows?


Sorry if we tested those, I want to think straight but I have 460+ post in my head :D

If we didn't, lets try those in that order adding them
First -skipcrowds only, then thatone PLUS Renaming, then shutting down hyperthreading or 4 cores in windows

Jeremy Clarkson
11-05-2015, 18:19
Please can you explain how to do numbers 1 and 2? Then I will be happy to test for you.

Aldo Zampatti
11-05-2015, 18:29
Please can you explain how to do numbers 1 and 2? Then I will be happy to test for you.


1) Very simple - In steam right click project cars, properties, Set launch options and write -skipcrowds
2) Goto the project cars folder, right click on your PCARS64.exe / click copy / then paste it on the same folder, you should have PCARS64 (1).exe /// Rename that to AFR-FriendlyD3D.exe // Double click this latter exe to run the game

Thanks a million, buddy!

Jeremy Clarkson
11-05-2015, 18:30
Thanks I'll get back to you shortly

funknerraw
11-05-2015, 19:05
I just want to post that I have the same issues as Jeremy... sometimes. Just like he does.

I have GTX 980s in SLI and when it's working properly, I can keep it pegged pretty close to a solid 60 FPS with Adaptive V-Sync enabled. I've checked GPU usage during these times and it peaks close to 100%, not quite 100 since I have adaptive vsync on. But every now and then I can be in a race, see I'm only getting 30-40 FPS, and when I check GPU usage, both are hovering around the 50% range. No settings change in game or anything, it just decides to do that. But then sometimes I can just close and restart the race, and it's fine again, running a solid 60 FPS with high GPU usage.

There isn't really anything in game that changes when it stops working correctly, it just seems to be random. Like, I can literally do the exact same race, same settings, same number of opponents, same weather, etc and I never know whether it will screw itself up or not. Thankfully it works correctly more than incorrectly, but it still happens now and then.

Aldo Zampatti
11-05-2015, 19:12
I just want to post that I have the same issues as Jeremy... sometimes. Just like he does.

I have GTX 980s in SLI and when it's working properly, I can keep it pegged pretty close to a solid 60 FPS with Adaptive V-Sync enabled. I've checked GPU usage during these times and it peaks close to 100%, not quite 100 since I have adaptive vsync on. But every now and then I can be in a race, see I'm only getting 30-40 FPS, and when I check GPU usage, both are hovering around the 50% range. No settings change in game or anything, it just decides to do that. But then sometimes I can just close and restart the race, and it's fine again, running a solid 60 FPS with high GPU usage.

There isn't really anything in game that changes when it stops working correctly, it just seems to be random. Like, I can literally do the exact same race, same settings, same number of opponents, same weather, etc and I never know whether it will screw itself up or not. Thankfully it works correctly more than incorrectly, but it still happens now and then.

Different system could lead to different things, like CPU, for instance, what is yours?

funknerraw
11-05-2015, 19:20
I'm running an i5 4690k @ 4.6Ghz, 2 x GTX 980 in SLI OC'd to 1366Mhz with 8GB Ram, running Windows 7. I've set an aggressive fan profile so the cards don't get hot enough to start throttling so it's not that. To be honest, it's not always the lack of 60 FPS that makes me notice something isn't acting right, (because with the GTX 980 sometimes it can still hit the 60FPS if its an empty track with clear weather) it's the fact I notice the fans aren't speeding up on my GPU (I can hear them when the cards are working hard) and then I check and the GPU usage is low.

As I mentioned, seems to run correctly most of the time until whatever causes the problem seems to just appear. It doesn't happen mid race/practice/qualifying, it seems either the event will start with the lower FPS / GPU usage or it will stay high the whole time.

I'm not super concerned about it, but I did come looking to the forums hoping I might find an easy fix, but when I saw this post I figured I should just chime in and say that I appear to be having the same issue, but as you said, it could be something else, we all know how finicky PC's can sometimes get :)

Aldo Zampatti
11-05-2015, 19:26
I'm running an i5 4690k @ 4.6Ghz, 2 x GTX 980 in SLI OC'd to 1366Mhz with 8GB Ram, running Windows 7. I've set an aggressive fan profile so the cards don't get hot enough to start throttling so it's not that. To be honest, it's not always the lack of 60 FPS that makes me notice something isn't acting right, (because with the GTX 980 sometimes it can still hit the 60FPS if its an empty track with clear weather) it's the fact I notice the fans aren't speeding up on my GPU (I can hear them when the cards are working hard) and then I check and the GPU usage is low.

As I mentioned, seems to run correctly most of the time until whatever causes the problem seems to just appear. It doesn't happen mid race/practice/qualifying, it seems either the event will start with the lower FPS / GPU usage or it will stay high the whole time.

I'm not super concerned about it, but I did come looking to the forums hoping I might find an easy fix, but when I saw this post I figured I should just chime in and say that I appear to be having the same issue, but as you said, it could be something else, we all know how finicky PC's can sometimes get :)

I might have some ideas for you to try if you're willing to, since your case is slightly different (no Hyperthreading) but you'll have to bear with me with some testing. I would appreciate it!

First thing first, Send me a screenshot of (in game) Options/Visual/Performance

funknerraw
11-05-2015, 19:28
Sure. I'm at work now (working hard as you can tell :)) but after work I'll be willing to give it a shot.

Also, if it matters, I am running triple 1080p screens, which is why the GTX 980 SLI is preferred instead of just running a single card.

Aldo Zampatti
11-05-2015, 19:33
Sure. I'm at work now (working hard as you can tell :)) but after work I'll be willing to give it a shot.

Also, if it matters, I am running triple 1080p screens, which is why the GTX 980 SLI is preferred instead of just running a single card.

Great so apart of what I've asked, I would ask you to disable VSYNC for testing, and if you can capture the GPU/CPU utilization graphs as Jeremy did.

snsn
11-05-2015, 19:35
than start learning how about config a game to make gpu or cpu high-priority.

and notice the eyes can only see 30fps and its not a shooter game.

just signed up to reply to you, reading this comment made my brain explode

I play CS:GO at a competitive level, and can tell the difference between 500FPS and 300FPS, and even more so 300FPS vs 100FPS. I run the game at a minimum of 200FPS @ 144hz and drops below 200 are immediately noticeable. Please take that stupid, sheepish opinion and never let it out again.

On-topic: I'm running a 290X (top of the line AMD card) and an i7 2600k overclocked to 5GHz (still a top 10-20 CPU) and I'm barely scratching 60fps irrelevent of settings. The performance I'm getting is DESTROYING my experience, 10-20 person races are impossible due to the lag caused, I mean I can actually see frames drop when dust is kicked up in sand traps, it's horrible.

Jeremy Clarkson
11-05-2015, 19:36
@funknerraw Have a look at post #71 on the previous page and see if you can replicate the tests I done to see if the issue is the same as mine. Also try with Vsync off so we can get a better idea on the situation.

Aldo Zampatti
11-05-2015, 19:41
just signed up to reply to you, reading this comment made my brain explode

I play CS:GO at a competitive level, and can tell the difference between 500FPS and 300FPS, and even more so 300FPS vs 100FPS. I run the game at a minimum of 200FPS @ 144hz and drops below 200 are immediately noticeable. Please take that stupid, sheepish opinion and never let it out again.

On-topic: I'm running a 290X (top of the line AMD card) and an i7 2600k overclocked to 5GHz (still a top 10-20 CPU) and I'm barely scratching 60fps irrelevent of settings. The performance I'm getting is DESTROYING my experience, 10-20 person races are impossible due to the lag caused, I mean I can actually see frames drop when dust is kicked up in sand traps, it's horrible.

http://forum.projectcarsgame.com/showthread.php?22797-AMD-graphics-bad-optimization Take a tour around 1st page here :) You'll see why!

funknerraw
11-05-2015, 19:42
@funknerraw Have a look at post #71 on the previous page and see if you can replicate the tests I done to see if the issue is the same as mine.

Sounds good, I'll use your settings as a baseline so we have something to compare. Knowing my luck, when I try to test it, it will work perfectly and only when I am convinced the problem is gone away and I am ready to actually race, will it crop up again lol.

Which software were you using for the graphs? I use Asus GPU Tweak for my OC'ing, and it has its own graphs showing the GPU usage, so I guess that should be fine as long as it gets the info across. And I'm thinking just using the resource monitor in windows to show CPU usage?

Jeremy Clarkson
11-05-2015, 19:50
I use MSI Afterburner which comes bundled with Riva tuner (which is very handy for in-game stats)


MSI afterburner also reports CPU stats FYI ;)

snsn
11-05-2015, 19:51
http://forum.projectcarsgame.com/showthread.php?22797-AMD-graphics-bad-optimization Take a tour around 1st page here :) You'll see why!

Was already using 15.4, worth downgrading to 15.3? My new wheel doesn't arive for another 16 days anyway so I don't mind waiting for a new driver much

SpaceGhost1911
11-05-2015, 20:00
Haven't read through the complete thread, but I have found that in the nVidia control panel add Project CARS to your game list and then set the Power Management to PREFER MAXIMUM PERFORMANCE. Pleae do NOT set this in your global as it will keep your boost clock speed up at all times. Only set it per application basis. This will probably significantly help your performance if you have not done so already.

Jeremy Clarkson
11-05-2015, 20:05
Haven't read through the complete thread, but I have found that in the nVidia control panel add Project CARS to your game list and then set the Power Management to PREFER MAXIMUM PERFORMANCE. Pleae do NOT set this in your global as it will keep your boost clock speed up at all times. Only set it per application basis. This will probably significantly help your performance if you have not done so already.

Thanks for your suggestion but I'm afraid that made zero difference.

Aldo Zampatti
11-05-2015, 20:34
Was already using 15.4, worth downgrading to 15.3? My new wheel doesn't arive for another 16 days anyway so I don't mind waiting for a new driver much

15.3 and 15.4 are pretty much the same for PCARS

Aldo Zampatti
11-05-2015, 20:35
Jeremy, where you able to test -skipcrowds and AFR renaming thingy?

cheers!

Jeremy Clarkson
11-05-2015, 20:43
Jeremy, where you able to test -skipcrowds and AFR renaming thingy?

cheers!

I haven't yet, I'll probably try sometime tonight, if not tomorrow for sure. I'll be sure to keep you posted.

Jeremy Clarkson
11-05-2015, 20:58
-skipcrowds
SLI ENABLED AA OFF
GPU USAGE
201618
FPS
201619


After Renaming pCARS.exe to d3d
SLI ENABLED AA OFF
GPU USAGE
201622
FPS
201624



I will update this post as I test..... I'm testing the other settings now.

Aldo Zampatti
11-05-2015, 21:03
Okey, so slightly better usage with -skipcrowds, still far from ideal. Right?

Jeremy Clarkson
11-05-2015, 21:15
Lets put them side by side and get a clearer picture.......


................................................................-skipcrowds................................After Renaming pCARS.exe to d3d
SLI ENABLED AA OFF .................................SLI ENABLED AA OFF...................SLI ENABLED AA OFF
GPU USAGE.................................................GPU USAGE...................................GPU USAGE
201626 201618 201622



Oh and for skipcrowds and renaming the exe I only done one lap... where as the results on the far left I done two laps

funknerraw
11-05-2015, 21:16
Well I was able to do a couple of tests on my lunch break today since I live not far from work. Unfortunately (or fortunately, I suppose) the tests ran just fine, GPU usage was high and with v-sync off framerates were well above 60 pretty much the entire time except for at the very start. I tried using the same settings but on Brands Hatch, since that was where I had the issue a couple of times, and it ran fine there as well.

When (If?) the issue comes up again I'll try to see if I can grab those graphs and I'll try to note if anything happens before the gpu usage goes down.

Jeremy Clarkson
11-05-2015, 21:23
How many laps did you do may I ask? Full laps?

funknerraw
11-05-2015, 21:42
How many laps did you do may I ask? Full laps?

I set for 3 laps like you did and ran the full races.

Jeremy Clarkson
11-05-2015, 21:48
Ah okay, good stuff!

Jeremy Clarkson
11-05-2015, 23:06
I've now tested with Nvidia's optimal settings for my system.....

201655
201656
201657

Same story........... NO AA = poor usage/fps...........AA on DS4X = better usage/fps with occassional spikes

Jeremy Clarkson
11-05-2015, 23:19
Same test as above using Nvidia's optimal settings NO AA everything else on High

Hyperthreading OFF
201659
201660


All I want to achieve is max GPU usage on any settings I choose (how it should be). This way I will be able to adjust the settings accordingly to achieve solid 60 fps with no dips. At the moment If I lower the settings or AA the GPU usage just drops, I can't afford to run with DS4X AA enabled all the time as it too has usage spikes (not as much) and the fps dips below 60 on occassions (rain for example), so I need to lower this, at the moment I cannot do this.

Aldo Zampatti
12-05-2015, 00:03
Can't thank you enough for all your efforts!!!

I'll ask around for more info and get back to you.

eduardxw
12-05-2015, 08:18
Guys, what's the point with -skipcrowds or Renaming pCARS.exe to d3d ?

Jeremy Clarkson
12-05-2015, 10:31
Skipcrowds removes the crowds from the game, which should deliver better fps throughout. I'm unsure what the d3d is supposed to do, it didn't do anything for me.

eduardxw
12-05-2015, 10:59
Ok, thank you
I'll give a try with -skipcrowds
What's the improvement about ? 10 -15 % ?
@Jeremy Clarkson, what is your resolution ?

Jeremy Clarkson
12-05-2015, 11:19
Sorry I can't answer that since my cards seem to be playing up with this game unfortunately, which is leading to bogus results.

My monitor is 1920x1080

eduardxw
12-05-2015, 11:25
Do you think it's worth to SLI the GTX 970 ? Or i should better wait for DX12 / Windows 10, and buy the GTX 980Ti, paired with GTX 970 ?
1440p and soon 4k
Thank you

PerFixAlot
12-05-2015, 11:33
I don't know if you have looked at this, or if it will show anything new, but have you checked with GPU-Z what the performance cap is caused by?

It shows on the sensor tab under "PerfCap Reason":
201756

If it says Util, like in the screenshot above, it is idling.
If SLI is the bottleneck it should show SLI.
If the card is throttling because of voltage being too low or fluctuating too much it shows VOp or VREL.
If it is not getting enough power is shows Pwr.
If it is overheating is shows Thrm.

With SLI setups you can simply run the application twice and select the other GPU in the second window, to see both at the same time.

You can get GPU-Z from here: http://www.techpowerup.com/downloads/SysInfo/GPU-Z/

Jeremy Clarkson
12-05-2015, 11:43
Great, I never knew you could do that with GPU-z. I'll check it out now, thanks !

PerFixAlot
12-05-2015, 11:48
Do you think it's worth to SLI the GTX 970 ? Or i should better wait for DX12 / Windows 10, and buy the GTX 980Ti, paired with GTX 970 ?
1440p and soon 4k
Thank you

With Le Mans and 56 cars and multi-class, SLI GTX970 works well with 1440p, but when I run 4k it hits the dreaded 3.5GB threshold unless I turn down most graphics settings.
With the 980s I get close to the 4GB limit with DSR 5160x2160, no AA and Ultra SMAA, but to me it is better looking even without AA enabled than lower resolutions with AA. 4K is less so it should be even better perfomance than I get, which is usually 55-60FPS.

I doubt waiting for DX12 will help with Project CARS, as I think the game would largely have to be rewritten from scratch to make use of the new features, so that is unlikely to be implemented.

eduardxw
12-05-2015, 12:10
My monitor is 1440p / 32 inch
I want a bigger display for gaming. 4K is too " hungry " for my GPU, even with SLI GTX 970 or GTX 970 paired with GTX 980Ti
I'm thinking about a 40 inch tv, full HD, but i don't know how the image quality will be, at this size - full hd
If i'd go for 4k / 40 inch, and turn down most graphics settings ( medium ) would that help with SLI GTX 970 ?

Jeremy Clarkson
12-05-2015, 12:16
OK so I've done a few tests whilst monitoring GPU-z.

I tested with:

SLI enabled, AA off then AA on. GPU-z Shows Vrel.

SLI disabled, AA off then on. Gpu-z shows Vrel.


After doing some research online it appears the Vrel reading simply means the card is at it's max boost clock due to voltage limitations set on the card - which is perfectly normal. Since a card does not have a infinite boost, it has to be limited in someway or another to prevent damaging the card. This on-going issue has nothing to do with boost clock anyway, it's to do with GPU usage.


So to conclude on this situation. This issue has nothing to do my with cards, since I can run all other games with max gpu usage on any gfx settings (how it should be), and GPU-z has just prooven there's no issue with my cards. This is not a vram bottleneck since I'm using way under my cards vram threshold. This is not a CPU bottleneck because my CPU stays around 60-75%. This has nothing to do with thermal throttling since my system is fully liquid cooled and temps rarely go above 50-55c. This has nothing to do with hyperthreading since this issue is still apparent with hyperthreading off. This only leaves one thing, unfortunately the game is badly optimised for (some) SLI users. Hopefully the devs look into this and come back with a solution promptly.

Traummann
12-05-2015, 12:28
so i tested today with two different GTX980 in SLI, and still the same problem :mad:

PerFixAlot
12-05-2015, 12:47
OK so I've done a few tests whilst monitoring GPU-z.

I tested with:

SLI enabled, AA off then AA on. GPU-z Shows Vrel.

SLI disabled, AA off then on. Gpu-z shows Vrel.


After doing some research online it appears the Vrel reading simply means the card is at it's max boost clock due to voltage limitations set on the card - which is perfectly normal. Since a card does not have a infinite boost, it has to be limited in someway or another to prevent damaging the card. This on-going issue has nothing to do with boost clock anyway, it's to do with GPU usage.


So to conclude on this situation. This issue has nothing to do my with cards, since I can run all other games with max gpu usage on any gfx settings (how it should be), and GPU-z has just prooven there's no issue with my cards. This is not a vram bottleneck since I'm using way under my cards vram threshold. This is not a CPU bottleneck because my CPU stays around 60-75%. This has nothing to do with thermal throttling since my system is fully liquid cooled and temps rarely go above 50-55c. This has nothing to do with hyperthreading since this issue is still apparent with hyperthreading off. This only leaves one thing, unfortunately the game is badly optimised for (some) SLI users. Hopefully the devs look into this and come back with a solution promptly.

VRel is normal when pushing the cards, most games should do that, unless it is set low and with a framerate cap.
I usally see VRel, VOp, and SLI, all at the same time when heavily overclocked. SLI is fairly normal too, because there is some overhead when using multiple GPUs.
What I would have found most unusual, but probably also more of a clue than the normal VRel you see, would have been if it was showing Util while under load. That would mean the game wasn't pushing the cards.

I wish I had some other ideas, in earlier days we would mess about with NVIDIA Inspector, but as far as I know SLI has been working well out of the box for most people since Nvidia included the SLI profile for pCARS some months ago.
I think for 3-way and 4-way SLI there are still people seeing improvements with custom tweaks in Inspector, but I don't know what they change and probably not related to this isssue.
So, unless someone has found some specific parameter to change there that helped with GPU utilization it probably won't be of any use to fiddle with now.

On the bright side some of us are expecting a pCARS Game Ready driver update from Nvidia anytime now, as pCARS was recently included in the GeForce Experience supported games. Maybe Nvidia has some insight we don't and have some improvements in that area when the next update is released.

MaXKiLLz
12-05-2015, 13:01
Don't drive yourselves nuts wondering if there's something wrong with your machines.

PerFixAlot
12-05-2015, 13:52
"after i do a screenshot with msi or steam, the fps and gpu usages going rapidly back to normal."

How about alt+tab? If you go to desktop and back to the game, does that also improve the GPU usage?

If so, I am wondering if something is shortly using GPU resources outside pCARS, perhaps Systinternals Process Explorer can show that:
https://technet.microsoft.com/en-us/sysinternals/bb896653.aspx?f=255&MSPPError=-2147217396

To see GPU usage go to the View menu, then click "Select Columns". In the "Process GPU" tab, enable "GPU Usage".
Then click on the GPU column header to sort by GPU usage.

Unfortunately, I don't know of any logging function in Process Explorer, so it is simplest if you have 2 monitors to have it on the 2nd monitor and watch it in real time.
If you only have one monitor I am not sure how to see it while playing, but at least you can test if something is using GPU resources while your computer is idle on the desktop.

Aldo Zampatti
12-05-2015, 15:40
Skipcrowds removes the crowds from the game, which should deliver better fps throughout. I'm unsure what the d3d is supposed to do, it didn't do anything for me.

renaming PCARS64.exe to AFR-FriendlyD3D.Exe (it should have the complete name) makes the driver behave in a different way for crossfire (AFR stands for Alternate Frame Rendering)

Aldo Zampatti
12-05-2015, 15:42
Threads merged for better follow up

Traummann
12-05-2015, 15:50
"after i do a screenshot with msi or steam, the fps and gpu usages going rapidly back to normal."

How about alt+tab? If

yes, than the gpu usage also goes back to normal.
However i have nothing in the background.

i dit prozess/service viewer, but no curios action here.
( i have two monitors )

im actually 100% sure, this problem is caused by project cars / nvidia driver.
because ( sometimes ) if i hit other cars in the race the GPU usage drops and wont go up until i restart the current race or doing an screenshot/alt tab.


SLI off = no problems

Aldo Zampatti
12-05-2015, 16:06
Some guys can workaround the issues, many others doesn't. So I don't expect everyone's issue to be caused by something like that :) Just wanted to make that clear to everyone.

I'm helping (or at least trying to) troubleshoot the issues to helps the DEVs to grab more information about those. :)

Jeremy Clarkson
12-05-2015, 16:13
im actually 100% sure, this problem is caused by project cars / nvidia driver.
because ( sometimes ) if i hit other cars in the race the GPU usage drops and wont go up until i restart the current race or doing an screenshot/alt tab.


SLI off = no problems


This is kind of what I experience also, it can just happen randomly, and around certain parts of a track. With me though what i don't get is if I turn AA off I get considerably less GPU usage/fps, than when I have AA set to DS4x

aqon99
12-05-2015, 16:27
I was having the same problem with 2x gtx780's. Going round spar in heavy rain with fps between 50-60, all of a sudden drops down to about 23 fps for about 15 seconds and shoots back up again. It was the actual grass details which was impacting performance with me. Ive actually replicated it and every time a turn off the grass detail in a heavy storm i dont get the slow downs. I can cope with having crappy grass.

Jeremy Clarkson
12-05-2015, 16:30
That's not the case here.... I've tried with the grass detail off and it doesn't help one bit

TC93
12-05-2015, 23:09
Hi there,

I also have SLI 760's and was surprised at the frame rates and quality I was getting..

I've read through this thread but can I just ask:

In summary what achieved the best results so far? AA turned on? etc.

Cheers

Aldo Zampatti
12-05-2015, 23:50
Hi there,

I also have SLI 760's and was surprised at the frame rates and quality I was getting..

I've read through this thread but can I just ask:

In summary what achieved the best results so far? AA turned on? etc.

Cheers

Sadly it depends. Read My post in this thread with all the suggestions. Also this one:
http://forum.projectcarsgame.com/showthread.php?22964-HELPFUL-POSTS-Check-here-for-Enhancing-Troubleshooting-Game-Experience

Jeremy Clarkson
13-05-2015, 12:27
@TC93 I've discovered that cranking everything up to max and put AA on DS4X I get better GPU usage/FPS than when having AA turned off (strange I know, and not ideal). If you get some spare time please have a look at post #77 and see if you can run the exact benchmark/settings that I have done.... obviously it may vary if you have a different CPU.


@aldo, Since I upgraded from Windows 8.1 to 10, there is no improvement on GPU usage unfortunately, I've tried the win10 driver and the win 8.1 driver, this issue is still here. Other than that I'm really enjoying the new look of Windows 10 ;)

MorciXL
13-05-2015, 12:54
@TC93 I've discovered that cranking everything up to max and put AA on DS4X I get better GPU usage/FPS than when having AA turned off (strange I know, and not ideal). If you get some spare time please have a look at post #77 and see if you can run the exact benchmark/settings that I have done.... obviously it may vary if you have a different CPU.


@aldo, Since I upgraded from Windows 8.1 to 10, there is no improvement on GPU usage unfortunately, I've tried the win10 driver and the win 8.1 driver, this issue is still here. Other than that I'm really enjoying the new look of Windows 10 ;)


About Windows 10.. So, is this not true? I heard that the improvement on fps running on w10 was notorious.
https://www.youtube.com/watch?v=XzFe5OOHZko

Aldo Zampatti
13-05-2015, 13:18
About Windows 10.. So, is this not true? I heard that the improvement on fps running on w10 was notorious.
https://www.youtube.com/watch?v=XzFe5OOHZko

It IS true for AMD. We (at least I) don't have any improvements reports for nvidia users

Jeremy Clarkson
13-05-2015, 13:32
About Windows 10.. So, is this not true? I heard that the improvement on fps running on w10 was notorious.
https://www.youtube.com/watch?v=XzFe5OOHZko

If you take the time to read this thread you will see myself and a few others are having issues with this game utilizing cards to their full potential with SLI enabled. I simply said Windows 10 has not improved the GPU usage issue.

Ed Mas
13-05-2015, 13:37
@TC93 I've discovered that cranking everything up to max and put AA on DS4X I get better GPU usage/FPS than when having AA turned off (strange I know, and not ideal). If you get some spare time please have a look at post #77 and see if you can run the exact benchmark/settings that I have done.... obviously it may vary if you have a different CPU.


@aldo, Since I upgraded from Windows 8.1 to 10, there is no improvement on GPU usage unfortunately, I've tried the win10 driver and the win 8.1 driver, this issue is still here. Other than that I'm really enjoying the new look of Windows 10 ;)



Perhaps a silly question but, have you tried using a different SLI profile with nvidia inspector? It might have been on the wmd forums there was a fellow who had made some profiles for SLI. Some people had better performance with different profiles. GPU usage not being 100% with SLI is not exclusive to your system though.

I've had similar usage as well with lower resolution and AA. The cards get fully utilized once I up the AA and resolution, which gave me the impression I was CPU limited (I don't know for sure, it's not my area). There may be room for gains with SLI down the road but don't quote me on that, one of the render guys might be able to answer.

Umer Ahmad
13-05-2015, 13:40
^BTW guys, Ed's the one who made the intro video for the game so how about a "Like" for him?

Aldo Zampatti
13-05-2015, 13:46
Perhaps a silly question but, have you tried using a different SLI profile with nvidia inspector? It might have been on the wmd forums there was a fellow who had made some profiles for SLI. Some people had better performance with different profiles. GPU usage not being 100% with SLI is not exclusive to your system though.

I've had similar usage as well with lower resolution and AA. The cards get fully utilized once I up the AA and resolution, which gave me the impression I was CPU limited (I don't know for sure, it's not my area). There may be room for gains with SLI down the road but don't quote me on that, one of the render guys might be able to answer.

Completely forgot about that..I'll ping him at his thread to see if he can/wants to suggest anything or post it here


EDIT: notified him. I'll keep this thread updated with his reply

Jeremy Clarkson
13-05-2015, 13:55
Hi Ed,

I haven't tried a different SLI profile. Please share with me and I will be happy to test them out.

Aldo Zampatti
13-05-2015, 13:58
Hi Ed,

I haven't tried a different SLI profile. Please share with me and I will be happy to test them out.

Hopefully he will be here if he sees my PM :) (he=the author of the homebrew sli profile)
I don't want just to 'steal' his profile and share it in public

Jeremy Clarkson
13-05-2015, 14:01
Ah okay, I get ya. No problem, hopfully he's in a great mood when he reads your pm lol

Ripgroove
13-05-2015, 14:21
Symptoms

60% GPU usage in game and 40FPS with 20 car grid and thunder storms (100+FPS in the dry)


Game Settings

Everything MAX at 1080p


PC

Intel I7-4790k
MSI Z97 Gaming 5
CM Hyper 212 EVO
2x EVGA 780ti SC's in SLI
16GB Corsair RAM
2x Samsung SSD's
Corsiar TX750 PSU (waiting on a Corsair HX1000w PSU in the post)


Just wondering why the LOW GPU usage while the game delivers low FPS, surely if the game was struggling it would be using 99% GPU usage, and if it wasn't struggling then why am I seeing low FPS. FYI I know that technically I'm getting good FPS in the dry as the game is totally maxxed but as above surely if i haven't hit the GPU usage ceiling then why the low FPS when I really push the game. Also my CPU should in no way really be bottlenecking my GPU's especially as CPU usage is rarely over 50% in game.

Aldo Zampatti
13-05-2015, 14:28
Thread Merged


Symptoms

60% GPU usage in game and 40FPS with 20 car grid and thunder storms (100+FPS in the dry)


Game Settings

Everything MAX at 1080p


PC

Intel I7-4790k
MSI Z97 Gaming 5
CM Hyper 212 EVO
2x EVGA 780ti SC's in SLI
16GB Corsair RAM
2x Samsung SSD's


Just wondering why the LOW GPU usage while the game delivers low FPS, surely if the game was struggling it would be using 99% GPU usage, and if it wasn't struggling then why am I seeing low FPS. FYI I know that technically I'm getting good FPS in the dry as the game is totally maxxed but as above surely if i haven't hit the GPU usage ceiling then why the low FPS when I really push the game. Also my CPU should in no way really be bottlenecking my GPU's especially as CPU usage is rarely over 50% in game.

Please read around this thread, you might find useful workarounds to increase your performance and we are still also looking for a suitable solution.

Ripgroove
13-05-2015, 15:43
Thread Merged



Please read around this thread, you might find useful workarounds to increase your performance and we are still also looking for a suitable solution.

Yeah sure, I'm happy as long as it's a known issue and is something that is being worked on. Don't want to go wasting time problem solving for something that turns out not to be client side and will probably be mended in a patch.

Aldo Zampatti
13-05-2015, 15:45
Yeah sure, I'm happy as long as it's a known issue and is something that is being worked on. Don't want to go wasting time problem solving for something that turns out not to be client side and will probably be mended in a patch.

that's why I said workarounds :) You can enhance it but as far as I saw, those with the issue were unable to solve it completely yet

Ripgroove
13-05-2015, 15:49
that's why I said workarounds :) You can enhance it but as far as I saw, those with the issue were unable to solve it completely yet
Yeah that makes sense. I'm happy waiting for an office fix tbh as in the past I've wasted countless hours fault finding only for it to not be my end that is the issue. Plus there's the fact that I literally built this PC yesterday so am pretty confident that it's not my end that's the problem especially considering the spec of it.

Ripgroove
13-05-2015, 15:55
Also just ran Firestrike om the 3dMark demo and scored 16356 which was better than 99% of all results so my rig "should" be just fine! lol

MrPix
13-05-2015, 19:18
Completely forgot about that..I'll ping him at his thread to see if he can/wants to suggest anything or post it here


EDIT: notified him. I'll keep this thread updated with his replyThanks Aldo. Hi Chaps.

I don't have SLI any longer so have no way of testing, but I did create a SLI (2-way only) Profile back in the day which helped many out with getting high usage from both GPUs and a considerable improvement in framerate before pCARS recognised multi GPUs. I'm not sure that it is still relevant now Nvidia has released a SLI Profile within their driver, but here it is anyway:

download_me (http://www.mrpix.co.uk/other/pCARS/download_pcars_7z.php)

.... the profile has been downloaded http://www.mrpix.co.uk/other/pCARS/pcars_7z.pngtimes so far! (dynamic counter)

You need to unzip the profile and apply it to the game with Nvidia Inspector. I've adapted some of the FAQ's below from the original WMD thread.

Q. Do you import the profile into Nvidia Inspector then run pCARS via steam as normal?
A. Yes, just import the nip file in Nvidia Inspector and run pCARS normally via the steam shortcut directly.

Q. Do you have to have Nvidia Inspector running for it to work?
A. No. Once the profile is imported and you have applied it, you can close Nvidia Inspector.

Q. Do I have to apply the profile everytime I reboot or before I start up pCARS?
A. No, Once applied, the profile is persistent between reboots.

Q. What happens if I update pCARS?
A. Updating pCARS has no effect on the SLI profile.

Q. What if I update my NVidia drivers?
A. The profile gets overwritten with the standard one, so you need to fire up Nvidia Inspector and import the profile again and apply the changes.

Q. Will this work on DX9 and DX11.
A. No, this profile is only for DX11.

Hope this helps, but as I say, it's historic and I have no way of testing

Aldo Zampatti
13-05-2015, 19:37
You rock!! Thanks

Traummann
13-05-2015, 19:42
i think a lot in this thread understanding this problem wrong.

Project cars scales SLI perfect.
both GPUs have 99% usage in Project cars.

So this can't be a driver bug.

This bug is caused by the game, MutliGPU rendering sems to be broken sometimes.

We can't do a shit, until the devs of this game do proper testing with SLI.


changing SLI bits is nonsense.
This wont help, you might get better GPU usage but less FPS.

majnu
13-05-2015, 19:43
Don't know why SLI is broken for some of you. Works perfectly for me with the latest NVIDIA drivers 350.12

I made a video earlier today and you can clearly see both cards are getting above 90% utalized.


https://www.youtube.com/watch?v=SKveTI-BKlk

Traummann
13-05-2015, 19:44
read post #152 again.

Ripgroove
13-05-2015, 19:59
SLI works perfect for me too, but GPU usage is low (50-60%), I'm almost certain that there is nothing to be done client side. SMS seems on the ball with this games optimisation so I'm sure it'll be fixed in a future patch.

Aldo Zampatti
13-05-2015, 20:24
SLI works perfect for me too, but GPU usage is low (50-60%), I'm almost certain that there is nothing to be done client side. SMS seems on the ball with this games optimisation so I'm sure it'll be fixed in a future patch.

Would you be kind enogh to try MrPix sli profile?

Ripgroove
13-05-2015, 20:26
Would you be kind enogh to try MrPix sli profile?

Yeah if it helps I could try it, never used Inspector before, can I just turn off the profile and put it back to normal after I've tried it?

Aldo Zampatti
13-05-2015, 20:29
Yeah if it helps I could try it, never used Inspector before, can I just turn off the profile and put it back to normal after I've tried it?


Absolutely

Ripgroove
13-05-2015, 20:32
Absolutely

OK if I get time tomorrow afternoon I'll give it a go and post the before and after results.

zoomer-fodder
13-05-2015, 21:13
im aply MrPix sli profile. and get updated 1.3 version CARS. now im going to test it. im text here when got fix that problem with 50% gpu load without alt+enter on some race-tracks.
sorry for bad english im russian.
3930+780sli=DSR 4K

majnu
13-05-2015, 21:39
To who ever asked me to upload my Graphical Settings:

http://i.imgur.com/e1b5ogS.png

http://i.imgur.com/MvW3VPA.png

http://i.imgur.com/rKjQkc0.png

http://i.imgur.com/VIe2yAk.png

http://i.imgur.com/CvPKf80.png

All other information on my Hardware setup, Track, Conditions, Opponents etc can be found in the "Show More" drop down box in the video from Youtube.

Edit - These pics are huge. @Moderators Is there no spoiler tag for me to hide them behind?

zoomer-fodder
13-05-2015, 21:50
And now i tested MrPix sli profile - its really work, but not without ALT+Enter. Without Alt+Enter i got now 75% gpu load, after Alt+Enter i got 99% on all problem tracks! THANKS!
with stock nvidia profile i got 50% after alt+enter on Nordschlife with HeavyRain. Now its fixed!

Traummann
13-05-2015, 21:59
changing SLI bits is nonsense.
This wont help, you might get better GPU usage but less FPS.

...
you have still the same bug dude.
so don't talk "its fixed"

Jeremy Clarkson
14-05-2015, 00:27
Thanks for your profile MrPix, but unfortunately that hasn't made a difference. With SLI enabled and AA off my GPU's are working at 50-60%, with SLI enabled and AA on DS4x they work at full usage, with occassional spikes. With SLI disabled, the GPU works at 100% no matter what graphical setting I use.

As Traummann has mentioned this issue must be related to the game and different varieties of hardware.

I really do hope the devs can work something out soon......because right now I'm not enjoying the inconsistency with fps/usage.

TC93
14-05-2015, 04:35
@JeremeyClarkson I got basically the exact same as yourself! Switched everything to ULTRA and turned AA to DS4X and boom, significant jump in FPS and quality.. Weird

MrPix
14-05-2015, 07:46
Thanks for your profile MrPix, but unfortunately that hasn't made a difference. With SLI enabled and AA off my GPU's are working at 50-60%, with SLI enabled and AA on DS4x they work at full usage, with occassional spikes. With SLI disabled, the GPU works at 100% no matter what graphical setting I use.

As Traummann has mentioned this issue must be related to the game and different varieties of hardware.

I really do hope the devs can work something out soon......because right now I'm not enjoying the inconsistency with fps/usage.Dare I say it, but that's almost how I would expect GPUs to work and SLI just adds more horse power (have had high end GPUS for a decade and SLI for 4+ years on 3 pairs/gens of Nvidia cards and crossfire before that so am speaking from my personal experience). If the GPU's are not being utilised or demand on their processing power is low, then why would they run at full bore to satisfy that demand? It does depend heavily on the way the game is coded and the way the graphics engine is tied in with all the other calculations so you do have a valid point Traummann.

I now have a single GPU and a single screen and if I run some games (inc pCARS) at 1080 with no AA and low quality, then my GPU runs at the speed it needs to, not 100% flat out, but just enough to keep up with the supplied information from the rest of my system such as the calculations of position of objects on track, cars physics, other cars and the track itself that the GPU can them draw a frame from. If that information is coming slower than the GPU can produce frames, then the GPU usage reflects that. It's not that it can't run faster in theory, it is that it does not need to in order to supply the frame.

If however I put the details to Ultra and apply AA and post AA and set resolution to 4K then the GPU has a lot more detail to draw for each frame and runs at full bore. The same would be true for SLI.

The FPS will be lower if the GPUs are not running at full speed, or they are not running at full usage (related but not he same thing) .. are your GPU clocks running at their full Mhz when the usage drops? I can force my single GPU to full speed with KBOOST so the speed will not vary but then the GPU usage is not recorded as a bi-product/known limitation, but I know I get best FPS if the GPU runs as fast as it can in game.

Ripgroove
14-05-2015, 08:36
If you have enough GPU horsepower that the GPU usage is going down then you should be able to max the game at 4k with infinite fps until some other hardware in your PC slows it down. GPU's should always be working at 99% load regardless of how many you have or how powerful they are. If you do manage to max a game out at 4k then the spare GPU power will just start working to create higher fps.

MrPix
14-05-2015, 08:46
If you have enough GPU horsepower that the GPU usage is going down then you should be able to max the game at 4k with infinite fps until some other hardware in your PC slows it down. GPU's should always be working at 99% load regardless of how many you have or how powerful they are. If you do manage to max a game out at 4k then the spare GPU power will just start working to create higher fps.The point is that this is not how it is working in pCARS and a few other titles, SLI or single...

Ripgroove
14-05-2015, 09:00
The point is that this is not how it is working in pCARS and a few other titles, SLI or single...

I know but this is how it should work, which is why I fully believe a few optimisation tweaks on their end will solve the issues and increase GPU usage to what it should be. Personally I'm lucky enough to be able to max the game at 1080p with my system even with only 50-60% GPU usage. The only time my fps drops below 60 is with a 20 car grid and rain/thunder. But hopefully when the GPU usage issue is solved that won't happen and I'll be maxing the game regardless of the weather.

Jeremy Clarkson
14-05-2015, 11:21
mrPix, In my eyes I think you are wrong there. With SLI disabled my GPU works at 100% regardless to what settings or resolution or track I choose. If I then turn SLI on that's when it starts playing up particularly when AA is OFF. All you have to do is look at all my tests on post #77.

You have to realise some people may have 120-144hz monitors, but yet they don't have the horse power to run the game with everything on ultra to achieve 120-144 fps. Now you say this game may be coded in such a way that it doesn't fully utilise a card if it's not under alot of stress is wrong. The game should utilise a card to its full potential regardless of what settings are selected. As I said, I get max usage with SLI disabled, and 50% usage with SLI enabled. In Assetto Cosa, if I put everything on low settings, I get full GPU usage on both cards which produces 200-300fps, If I want to play at a very high frame rate in this game then I should be able to do so by lowering my settings, but unfortunately it doesn't work this way, if I lower my settings I get worse fps/usage.


Project Cars Tests

SLI DISABLED, AA OFF
GPU USAGE
201572
FPS
201573

SLI ENABLED AA OFF
GPU USAGE
201576
FPS
201577

SLI ENABLED AA - DS4X
GPU USAGE
201578
FPS
201579
[B]

As you can see, more consistant fps with AA set to DS4X... it certainly shouldn't be this way.

The thruth of the matter is in all the tests posted on this thread, others have now confirmed the same issue. Now it's just a waiting game until the devs speak up. Thanks to everyone who has tried to help, much appriciated.

Jeremy Clarkson
14-05-2015, 11:22
@JeremeyClarkson I got basically the exact same as yourself! Switched everything to ULTRA and turned AA to DS4X and boom, significant jump in FPS and quality.. Weird

Great, so there is something clearly up with the game. Thanks for taking the time to test.

zoomer-fodder
14-05-2015, 11:47
i tested more i got 50% gpu load on some other tracks. ALT+Enter not need, if i select restart race session in game menu, its work like alt+enter.
Im dont understand what i need for fully fix that bug. I play DSR 4K on GTX780 SLI @ 1.2Ghz setup without AA. Nordschlife with Heavy Rain and 31 opponents on "road cars - same class" i got 38fps min and 48fps average on this settings. all maxedout ultra.

MrPix
14-05-2015, 12:33
mrPix, I'm afraid you are wrong there. With SLI disabled my GPU works at 100% regardless to what settings or resolution or track I choose. If I then turn SLI on that's when it starts playing up particularly when AA is OFF. All you have to do is look at all my tests on post #77.

You have to realise some people may have 120-144hz monitors, but yet they don't have the horse power to run the game with everything on ultra to achieve 120-144 fps. Now you say this game may be coded in such a way that it doesn't fully utilise a card if it's not under alot of stress is wrong. The game should utilise a card to its full potential regardless of what settings are selected. As I said, I get max usage with SLI disabled, and 50% usage with SLI enabled.

OK no problem, I was speaking about my setup and experience with pCARS. The 760 is quite a way off the Titan X in terms of raw GPU horse power. I get about 35-61% GPU usage and 1530MB VRAM at 1080p AA off low IQ with an average of 420fps with a full grid at Silverstone.

It's subjective and neither of us is wrong. I do realise that many people use different refresh rates, I'm not an idiot or a noob at these things, I speak from my experience and have been working with getting the best out of pCARS over a 42 month period, which is why I fiddled with the profile in the first place.. and got great results.... over 3000 downloads of the profile and only 1 or 2 that did not get benefit from a FPS AND GPU usage point of view.

I was asked to post in this thread by one of the mods to try to help. I'm sorry it didn't help you.

In your case the SLI scaling is just not working for some reason... but it is working better for others so you need to try to narrow down the differences. For instance I get much better GPU usage (98%) by turning up the AA to DS4x and IQ settings to max but my fps drops to 115 with VRAM usage up to 2476MB. So, without breaching your VRAM limit (2GB on a 760 setup?) do you get better GPU usage by turning up the settings (fps may rise or fall obviously)?

Jeremy Clarkson
14-05-2015, 12:54
OK no problem, I was speaking about my setup and experience with pCARS. The 760 is quite a way off the Titan X in terms of raw GPU horse power. I get about 35-61% GPU usage and 1530MB VRAM at 1080p AA off low IQ with an average of 420fps with a full grid at Silverstone.

It's subjective and neither of us is wrong. I do realise that many people use different refresh rates, I'm not an idiot or a noob at these things, I speak from my experience and have been working with getting the best out of pCARS over a 42 month period, which is why I fiddled with the profile in the first place.. and got great results.... over 3000 downloads of the profile and only 1 or 2 that did not get benefit from a FPS AND GPU usage point of view.

I was asked to post in this thread by one of the mods to try to help. I'm sorry it didn't help you.

In your case the SLI scaling is just not working for some reason... but it is working better for others so you need to try to narrow down the differences. For instance I get much better GPU usage (98%) by turning up the AA to DS4x and IQ settings to max but my fps drops to 115 with VRAM usage up to 2476MB. So, without breaching your VRAM limit (2GB on a 760 setup?) do you get better GPU usage by turning up the settings (fps may rise or fall obviously)?

Yes, by turning the setting up I get better fps/usage in most cases, which is not ideal since I want to lower my settings and get a better more consistant frame rate. Every other game I play I can change the settings how I want and GPU usage is pinned at around 100% since there is no fps limit enabled, this is how games are supposed to run. Usage shouldn't be throttling down causing lower frame rate/usage when lower settings are enabled.

As I mentioned about high refresh rate monitors, how would I go about reaching 144 fps, if the game just doesn't utilise my cards when I lower the settings, it doesn't make sense.

There is a clear issue and the devs need to look at it. It's not just 1-2 people having this issue either, there is quite a few from what I've seen on this forum and on the Steam page.


I really do appriciate your help by posting a link to your SLI profile, thanks for that.

MrPix
14-05-2015, 13:52
@Jeremy Clarkson - sorry if I've missed it but you are running the latest drivers?

I agree it doesn't make sense and pCARS is not alone with this issue with SLI. It's partly down to the game optimisation by SMS and partly down to the driver being tweaked by Nvidia to be more inline with how the game puts out from the graphics engine to the driver. There are guidelines laid down by Nvidia and also quite loose ones and to get perfect alignment is not always possible... it's like digging a tunnel from both ends and using rough drawings and dimensions... sometimes it take a tweak at either end to make sure the diggers meet in the middle perfectly, but one without the other may not work out to be 100% correctly aligned.

SMS have done some great things with their graphics engine and it is visually stunning and it wasn't until quite recently in the big scheme of things that Nvidia actually got involved and produced it's own SLI Profile .... Nvidia updated it's SLI Profile with the recent release of drivers (350.12) but maybe SMS have changed something in the code after that that is affecting things.... that said, it has never been perfect and as I alluded to previously, it was a long time (years) before Nvidia even had an SLI Profile in their drivers for pCARS.

It's a real shame I don't have SLI any longer as I'm sure I would be able to figure out what is going on better, but I left it behind when I didn't need the hassle of it all any longer.... most of the games and sims I was and am playing had not got great SLI Profiles anyway.

Harjan
14-05-2015, 14:49
I'm having the same GPU usage problems.

When i race on the Dubai track i get around 90-100 FPS (95-99% GPU usage on all 3 GPU's) with everything maxed out (AA=DS2X). But when i switch to lets say hockenheim, it fluctuates between 20 and 70 FPS (30-85% GPU Usage). While all the settings are the same. It's a shame, because this really makes the game unplayable.
It seems like that the grass is the problem, as it runs fine on dubai. could this be the case or is it just a coincidence ?

Setup :

Intel Core i7 4930K @ 4.5 GHZ
Asus Rampage IV Black Edition
64 GB Corsair Dominator Platinum 2133Mhz
3 x Nvidia GTX Titan in SLI (running on latest nvidia driver)
3 x ROG swift G-sync enabled monitor (in surround)
Windows 8.1
running the game on 7854 x 1440



Edit :
It was because of the grass, turned Detailed grass 'OFF' and it works like a charm :D
GPU Usage rarely drops below 90% and averaging around 96% on all 3 GPU's

NickBRCM
14-05-2015, 17:18
Low CPU and GPU % load issue with GTX 980 Classified and i5 3330, and its not hardware problem. Only have this type of problem with this game.
GPU at 51% and CPU at 79%. 60 FPS only with GeForce Experience settings but with this settings, the game looks bad, worse than GRID Autosport (I run with 100 FPS in GRID at the Max Settings)
The DS4X works ?

Aldo Zampatti
14-05-2015, 17:27
Yes it works (DS4x)

willsnone
14-05-2015, 18:58
Hi, my Project Cars going very badly with SLI.
Somehow, the game only between 25-35 fps.
Have just a GPU utilization of 30-40% and the CPU usage I've also only 40%.
When I put the settings on low / medium runs the game even faster but de usage of GPU / CPU decreases again to 20-30%.
Vram utilization varies between 1.7 and 2,3gb depending on which setting I have.
Have got hold of you a hint why my Grakas and CPU utilization only so low?
Would the Grakas running at 99% occupancy I were somewhere at 60fps up and perfect.

My buddy has also SLI and the GTX 780 has at both 99% utilization running ... of course perfectly. Can someone tell me whats wrong with my Sys?? ... So absolutely makes it no fun. Thx and greetings

GPU 2 x Gtx970
CPU XEON 1231v2
8gb RAM
64bit Win 7
All updates currently
New nvidea driver is installed

NickBRCM
15-05-2015, 00:17
With SMAA on Low and all the settings on Ultra I'm running with 50-60. Vey bad to my 144Hz monitor

Traummann
17-05-2015, 02:03
So back from testing.

on win10 pre. build 10074 the bug is gone :peach:
http://images.akamai.steamusercontent.com/ugc/539648840569905225/FD45339632CE9A6AE8E4B76BAC75DB19DC9978CF/

less FPS( 5-8fps ) but not GPU usage drops/frame drops at all

driver version: 352.84 WIN10 WHQL

CptAhnungslos
17-05-2015, 11:21
Did not read the entire thread and I donīt know if the Sli usage problem was solved but I just want to share my experience.
When I set "V-Sync (smooth)" in NVCP, I get 60-70% usage with around 70 FPS.
When I set normal V-Sync in NVCP, I get 85-95% usage and 100-110 FPS.
All in default graphic settings except detailed grass off, Spa, 19 AI, sunny weather, no acceleration, driver 347.88.
Hope this helps.

Ripgroove
17-05-2015, 11:30
Did not read the entire thread and I donīt know if the Sli usage problem was solved but I just want to share my experience.
When I set "V-Sync (smooth)" in NVCP, I get 60-70% usage with around 70 FPS.
When I set normal V-Sync in NVCP, I get 85-95% usage and 100-110 FPS.
All in default graphic settings except detailed grass off, Spa, 19 AI, sunny weather, no acceleration, driver 347.88.
Hope this helps.

Mine is set to the normal "On" in NVCP and my GPU usage is 50-60%

eduardxw
17-05-2015, 12:07
Did not read the entire thread and I donīt know if the Sli usage problem was solved but I just want to share my experience.
When I set "V-Sync (smooth)" in NVCP, I get 60-70% usage with around 70 FPS.
When I set normal V-Sync in NVCP, I get 85-95% usage and 100-110 FPS.
All in default graphic settings except detailed grass off, Spa, 19 AI, sunny weather, no acceleration, driver 347.88.
Hope this helps.

I wonder how SLI GTX 970 would be @4k
About 40-45 FPS average, with AA of , V-Sync on, and everything to medium - high ?

TimResin
17-05-2015, 22:27
I have read through this entire thread. Tried the ultra ds4x trick no 100% for my 970Sli setup. Used Mrpix inspector profile no luck. Running the game at 50 fps at ultra with 2 970 is ridicoulous. When are they going to fix this

MrPix
17-05-2015, 22:39
Mine is set to the normal "On" in NVCP and my GPU usage is 50-60%If you disable v-Sync, what happens then?

Ripgroove
18-05-2015, 16:32
If you disable v-Sync, what happens then?

Same, GPU usage remains low FPS hovers between 30-80 depending on track/number of opponents/proximity to AI etc etc. It would be nice if I could get my GPU's constantly running on 99% as they should be. Going by my performance with low GPU usage if they were working fully I shouldn't have any FPS drops below 60 at all regardless of the situation.

Will disable SLI tomorrow and see what happens then.

GhostInductee
18-05-2015, 19:14
Ey people sometimes quite seriously yes I have just the latest NVIDIA driver 352.86 it and I must regretfully notice that the FPS under a GPU is better than under 2 .... how can that be if you please, I have just in the career mode the yield Spa tested in the rain ..... envoirment mapping the particle was at full stretch to low to change details at full ........ and I have damn 40-46fps WITHOUT SLI WTF ??? Guys I mean how can that be hell ?? If I have SLI Activate 3-5fps even less ...... old what is this Take care about finally else I demand my money back .......I mean you have to turn and NVIDIA especially since neither the CPU nor GPU work really need to work ..... in Single GPU clear because it is up to 95% GPU load in SLI but only 60% and whether in single or SLI GPU only 1700-1800 memory Usage.

But does not excuse the wrong I understand really all settings tried by yes ..... but one thing I am sure that SLI is not really used much ............ I Try SLI profile MrPix ..... and so .... but I'm sure now that you have SLI not really well optimized because it is not just me, there are many other users who have the problem with SLI ..... Hence my request to the developers wake up please and do what else ... I see myself simply forced my money prefer to invest in the Witcher or in a PS4 and Drive Club ..... I do not want to be misunderstood, nor as total fool .... aver you have your mouth as far been wearing until now I feel but only hot breath ..... that's my statement since the release of the Game

Sry for my bad English i hope you guys understand me


Oooh I forget an important detail my system:

AMD FX 8350
Gigabyte GTX 780 3GB SLI
ASUS M599FX Pro 2
Corsair 2x4GB XMS3
Windows 8.1 64Bit
Corsair h100i

Ripgroove
18-05-2015, 19:40
I also have low SLI usage (40-60% mostly), will test with SLI disabled tomorrow morning. Hopefully its just a driver issue that will be fixed soon.

GhostInductee
18-05-2015, 20:13
I also have low SLI usage (40-60% mostly), will test with SLI disabled tomorrow morning. Hopefully its just a driver issue that will be fixed soon.


Sure but i hope you know what i mean.......that is so fucking sick for me

thepharcyde
18-05-2015, 20:13
Apologise for your language, somewhat unnecessary?

SLI is fine for me

GhostInductee
18-05-2015, 20:15
Apologise for your language, somewhat unnecessary?

SLI is fine for me

Yes I apologize because I use Google Translate for ...... and I'm happy for you but if it runs with you wonder why it does not work with other .....

MysterG
19-05-2015, 06:39
I'll give you the benefit of the doubt this time, and edit out your swearing in the title.
This is not how we ask for help round here.

Ripgroove
19-05-2015, 06:46
OK so just disabled SLI and my single GPU usage was a constant 98% which is where it should be. I tested with the same track/car/weather as I did with SLI enabled but left my in game graphics settings the same so overall my FPS was down by 10FPS.

So that's it then, the game does not like SLI.

I'm going to re enable it as I do get a very slight gain of 10FPS but the fact remains:

SLI Enabled = low GPU usage (40-60%) with 40-70FPS
SLI disabled = high GPU usage (98%) with 40-60FPS

This is clearly something that can't be fixed client side as so many people are experiencing the exact same thing, trying to "fix" it our end by various tweaks just won't work, it's either an issue with the game optimization or a Nvidia driver issue. I really hope this gets fixed soon.

Sankyo
19-05-2015, 06:56
Yes I apologize because I use Google Translate for ...... and I'm happy for you but if it runs with you wonder why it does not work with other .....
That may be something down to your local configuration and not so much to the game. Hence, if you report an issue, be sure to first check (possibly with the help of the forum here) whether it's your system that has problems instead of blaming the game.

Ripgroove
19-05-2015, 06:58
SLI does not work for me either do I doubt it's an issue on his end TBH.

SLI enabled = 40-60% usage & 40-70fps
SLI disabled = 98% usage & 40-60fps

Same car/track/weather etc

mcaran
19-05-2015, 07:00
Well...I think that the most people here are actually being very kind. If you take into account that one of the most hyped games of this year is released full of bugs than I understand every sinlge reaction here...This game feels like still being in BETA stage and it's quite a shame that people are paying the full wack for a BETA game.

MysterG
19-05-2015, 07:08
Well...I think that the most people here are actually being very kind. If you take into account that one of the most hyped games of this year is released full of bugs than I understand every sinlge reaction here...This game feels like still being in BETA stage and it's quite a shame that people are paying the full wack for a BETA game.

That has absolutely no relevance to the issue.
Asking for help in a constructive way is not a great hardship and will more likely garner results.

We are trying to keep this thread on track and get the guy some help. You trying the drag it off course is not helpful to the OP or anyone else.

rbl
19-05-2015, 07:29
Plus there's the fact that I literally built this PC yesterday so am pretty confident that it's not my end that's the problem especially considering the spec of it.
So there is no point in asking about dust inside:cool:

But did you run any CPU benchmarks and stress tests to confirm that the cooler is installed correctly and the CPU can reach the same performance as in benchmarks posted on the net? Sometimes the cooler won't "sit" properly (too much or not enough thermal paste for example) and you might not notice that with normal use, but under stress the CPU will begin throttling to compesate.

Just an idea to try...

also - have you tried the -dx11mt and/or -pthreads 4 startup parameters?

Ripgroove
19-05-2015, 07:52
So there is no point in asking about dust inside:cool:

But did you run any CPU benchmarks and stress tests to confirm that the cooler is installed correctly and the CPU can reach the same performance as in benchmarks posted on the net? Sometimes the cooler won't "sit" properly (too much or not enough thermal paste for example) and you might not notice that with normal use, but under stress the CPU will begin throttling to compesate.

Just an idea to try...

also - have you tried the -dx11mt and/or -pthreads 4 startup parameters?

Yes I ran Prime95 for an hour and have also ran the Firestrike benchmark several times which gives expected results. I have also tried those launch options.

Andrey Filatov
19-05-2015, 08:28
Project Cars profile in GeForce drivers hasn't been changed since they actually introduced it. Since there were some considerable changes in the engine just before the release the profile doesn't perform that good.
I found out that Homebrewed SLI Profile, made by MrPix works better for me. I've tried switching SLI compatability bits via nVidia inspector and it worked.
ATM I'm using these bits - 0x000110FB. (Profile v3.1 as far as I can remember)
For me the FPS with these settings is much more stable and consistent.

P.S. I've got 2xGTX 780 SLI.

Aldo Zampatti
19-05-2015, 13:34
Project Cars profile in GeForce drivers hasn't been changed since they actually introduced it. Since there were some considerable changes in the engine just before the release the profile doesn't perform that good.
I found out that Homebrewed SLI Profile, made by MrPix works better for me. I've tried switching SLI compatability bits via nVidia inspector and it worked.
ATM I'm using these bits - 0x000110FB. (Profile v3.1 as far as I can remember)
For me the FPS with these settings is much more stable and consistent.

P.S. I've got 2xGTX 780 SLI.

to expand.. MrPix's Profile here: http://forum.projectcarsgame.com/showthread.php?22928-Terrible-SLI-Gtx760-GPU-usage&p=907450&viewfull=1#post907450

Ripgroove
19-05-2015, 14:01
to expand.. MrPix's Profile here: http://forum.projectcarsgame.com/showthread.php?22928-Terrible-SLI-Gtx760-GPU-usage&p=907450&viewfull=1#post907450

I take it you've seen an improvement with your GPU usage and FPS with this profile applied? If so how much? I also have SLI 780ti's and currently my usage varies greatly depending on track/cars/etc but generally it hovers around the 40-60% range. I'm willing to give the Inspector profile a go if you've seen a decent increase.

EDIT/ Ignore me, just seen that you are running AMD GPU's

Ripgroove
19-05-2015, 14:04
Thanks Aldo. Hi Chaps.

I don't have SLI any longer so have no way of testing, but I did create a SLI (2-way only) Profile back in the day which helped many out with getting high usage from both GPUs and a considerable improvement in framerate before pCARS recognised multi GPUs. I'm not sure that it is still relevant now Nvidia has released a SLI Profile within their driver, but here it is anyway:

download_me (http://www.mrpix.co.uk/other/pCARS/download_pcars_7z.php)

.... the profile has been downloaded http://www.mrpix.co.uk/other/pCARS/pcars_7z.pngtimes so far! (dynamic counter)

You need to unzip the profile and apply it to the game with Nvidia Inspector. I've adapted some of the FAQ's below from the original WMD thread.

Q. Do you import the profile into Nvidia Inspector then run pCARS via steam as normal?
A. Yes, just import the nip file in Nvidia Inspector and run pCARS normally via the steam shortcut directly.

Q. Do you have to have Nvidia Inspector running for it to work?
A. No. Once the profile is imported and you have applied it, you can close Nvidia Inspector.

Q. Do I have to apply the profile everytime I reboot or before I start up pCARS?
A. No, Once applied, the profile is persistent between reboots.

Q. What happens if I update pCARS?
A. Updating pCARS has no effect on the SLI profile.

Q. What if I update my NVidia drivers?
A. The profile gets overwritten with the standard one, so you need to fire up Nvidia Inspector and import the profile again and apply the changes.

Q. Will this work on DX9 and DX11.
A. No, this profile is only for DX11.

Hope this helps, but as I say, it's historic and I have no way of testing

Is this currently the only method of improving GPU usage on SLI setups? I have SLI 780ti's and currently my usage varies greatly depending on track/cars/etc but generally it hovers around the 40-60% range. I'm willing to give the Inspector profile a go if I'm likely to see a decent increase?

kjay
19-05-2015, 14:22
The link that he posted is for a Nvidia SLI profile.

Ripgroove
19-05-2015, 14:24
The link that he posted is for a Nvidia SLI profile.

I know.

dwaynetheBLADE
19-05-2015, 14:42
to be honest the only time I have issues is with the texturing with SLI

JeyD02
19-05-2015, 14:59
to expand.. MrPix's Profile here: http://forum.projectcarsgame.com/showthread.php?22928-Terrible-SLI-Gtx760-GPU-usage&p=907450&viewfull=1#post907450

WOW thats a huge improvement. wit this ppl should be totaly fine.

Aldo Zampatti
19-05-2015, 15:45
WOW thats a huge improvement. wit this ppl should be totaly fine.

Have you tried? Can you post before/after results?

It would be nice for future users :)

Aldo Zampatti
19-05-2015, 15:46
Maybe others users can jump in and relate their experience. The good thing about trying this, is that it will only take you a few minutes to setup and it won't break anything

Ripgroove
19-05-2015, 15:48
Maybe others users can jump in and relate their experience. The good thing about trying this, is that it will only take you a few minutes to setup and it won't break anything

Yeah I will give it a go tomorrow morning maybe.

JeyD02
19-05-2015, 16:20
Have you tried? Can you post before/after results?

It would be nice for future users :)

well my usage were on about 64-87/40-90
now with this 80-88/80-96

Jeremy Clarkson
19-05-2015, 18:14
Just thought I would drop in and say this issue is still not resolved with the new Nvidia driver on a fresh installation of win 8.1 pro......

Just tried to play the game for the first time in a couple of days, and I face unhanded exception crashes and low gpu usage, same story different day. Very unenjoyable I must say.

Time to put this game away for a while.

Ripgroove
19-05-2015, 18:28
Just thought I would drop in and say this issue is still not resolved with the new Nvidia driver on a fresh installation of win 8.1 pro......

Just tried to play the game for the first time in a couple of days, and I face unhanded exception crashes and low gpu usage, same story different day. Very unenjoyable I must say.

Time to put this game away for a while.

I also built a new rig last week with a fresh install of Win8.1, I've not had a single crash at all BUT my SLI GPU usage needs to be better.

Ripgroove
20-05-2015, 08:12
Can't seem to import that profile in to Inspector, Inspector does not seem to recognize the ".7z" file extension?

Bruno Alexandre
20-05-2015, 08:21
Extract first, the 7zip file is just a compressed archive like zip, rar, etc..

rbl
20-05-2015, 08:40
and if you don't have 7zip install it from here
http://www.7-zip.org/

Ripgroove
20-05-2015, 09:06
I did extract the .rar, and there was a .7z inside, didn't realise that needed extracting also.

rbl
20-05-2015, 09:16
I downloaded the file to test the extraction and I didn't get any .rar file. The file I downloaded was directly .7z and inside you will find 2 files: pcars.nip and readme.txt

Ripgroove
20-05-2015, 09:20
Oh OK I'll have another look, I was in a bit of a rush when I did it.

Ripgroove
20-05-2015, 09:28
OK got it, so just one more question, how do I revert back to my original settings if needed? Is it just a case of switching back to the _GLOBAL_DRIVER_PROFILE (Base Profile)?

Ripgroove
20-05-2015, 09:42
Wow just tried it and my FPS went from 60 down to 30! So it clearly doesn't help me out.

Ripgroove
20-05-2015, 10:01
So how do I 100% revert back to how it was before?

Jeremy Clarkson
20-05-2015, 12:44
Re-install your Nvidia drivers.

GhostInductee
20-05-2015, 12:49
That may be something down to your local configuration and not so much to the game. Hence, if you report an issue, be sure to first check (possibly with the help of the forum here) whether it's your system that has problems instead of blaming the game.

No Dude my system is not the Bottleneck.....definitely not.
There are people who have a GTX 670 and it runs better there ..... pushes do not blame the players ..... because my system even extends out to GTA V to gamble on Ultra ... and yes I know it is ne other but the engine got it to himself the whole 6GB of VRAM to use a positive .... only Slightly Mad Studios while allegedly not tell Yes it's mean to be played and so ....

Jeremy Clarkson
20-05-2015, 12:51
I find it odd how this thread hasn't been addressed to the "known issues thread" since there is clearly a big issue here, and it's not just 1-2 people facing this issue.

It would be nice to have this issue mentioned on the known issues thread so that we actually have reassurance that it is being looked at............... they have things like "nationalities missing" but a vital issue such as this thread just left in the dark, leaving us no idea what is going on.

Ripgroove
20-05-2015, 12:52
Re-install your Nvidia drivers.

Really? I was led to believe I could just switch back.

Jeremy Clarkson
20-05-2015, 12:56
I don't know mate, maybe there is, but I just reinstall as it only takes a minute

Aldo Zampatti
20-05-2015, 14:45
Really? I was led to believe I could just switch back.

There's a button in nvidiaInspector which will directly load defaults. That one and delete the profile you've downloaded. apply and from nvidia control panel 3dSettings, select defaults for PCARS64.exe

Aldo Zampatti
20-05-2015, 14:50
No Dude my system is not the Bottleneck.....definitely not.
There are people who have a GTX 670 and it runs better there ..... pushes do not blame the players ..... because my system even extends out to GTA V to gamble on Ultra ... and yes I know it is ne other but the engine got it to himself the whole 6GB of VRAM to use a positive .... only Slightly Mad Studios while allegedly not tell Yes it's mean to be played and so ....

Can you post a screen shot of your VIsual FX and Performance tab in Options/Visual Menu, please?

Also how many FPS are you getting in which condition? (like xx frames per second in start/finish line with 20 cars on grid of XXXX circuit with Clear Weather)?

Ripgroove
20-05-2015, 17:13
There's a button in nvidiaInspector which will directly load defaults. That one and delete the profile you've downloaded. apply and from nvidia control panel 3dSettings, select defaults for PCARS64.exe

Nothing jumped out at me but I will have another look tomorrow.

GhostInductee
20-05-2015, 17:29
Sure on Clear weather i have from the Start 35fps with 16 Cars......on Spa And increase the fps if I only a few AI players have also 50fps before me .......

203712203713203714

Aldo Zampatti
20-05-2015, 17:44
(I'm learning so many languages here!!!) :)
I'll ask a few things for you to try, if you're kind enough to try them.

Please, keep testing the same baseline, as you said, 16 cars AI on SPA, positioned LAST on the grid is fine. You have a baseline, write down those numbers (lowest and highest) or, if you can, use FRAPS and capture 30/60 seconds while standing still on the grid. That should give you Min Max and Average FPS from that timeframe.

Once you have your baseline:
1) Change RENDER FRAMES AHEAD from 1 to 2 on your VISUAL/Performance options (in-game). Run the test again, post results, please
2) Add -skipcrowds to your launch options parameter in STEAM - again, re-run test, post results.
3) copy (don't rename!) your PCARS64.exe to AFRFriendly-D3D.exe and run the game while double clicking that EXE file. - Once again, re-run tests, and post results.

I want to know this numbers first before passing info for to devs/other threads.

thanks a lot!

Joeri Blootacker
20-05-2015, 18:40
The more i throw at it, the better it runs :)
upped from DS6X to DS9X and grass from Off to Ultra, and it runs butter smooth.
usage peaking to both 98%, but mostly at about 75%

i guess i wasn't pushing my GPU's enough.
Vsync set to ON in NVCP (the regular ON, not the Smooth one for SLI)
locked at 60fps 1920*1080 res. (yeah yeah... i know SLI is overkill for that....)

Ripgroove
20-05-2015, 19:15
The more i throw at it, the better it runs :)
upped from DS6X to DS9X and grass from Off to Ultra, and it runs butter smooth.
usage peaking to both 98%, but mostly at about 75%

i guess i wasn't pushing my GPU's enough.
Vsync set to ON in NVCP (the regular ON, not the Smooth one for SLI)
locked at 60fps 1920*1080 res. (yeah yeah... i know SLI is overkill for that....)

To some extent I've found the same also, BUT I've also found that FPs can change dramatically even when starting the exact same race with exactly the same settings which makes testing these things very difficult. Currently with almost everything at max settings I mostly maintain the 60fps I need (vsync on) but it will dip to 40-50fps when on a full starting grid in the wet/thunder, the FPS gradually increases back to 60 as the pack spreads out and I am out in open space on my own, if the pack bunches up again though again it will drop back to 40-50fps. During all this my GPU usage mainly hovers around 50-60% but can spike up to 98% at certain times on certain tracks.

For now I'll have to put up with it but really I expected an SLI 780ti Superclocked setup to easily maintain 60fps in all track/weather/car conditions at a mere 1080p, (after all as EVGA put it "The EVGA GeForce GTX 780 Ti is the best gaming GPU on the planet", and I have two of them!), maybe it will when (if) the SLI usage issues are sorted out and both GPU's are chugging away at a constant 99% usage like they should, who knows? With no word from the devs on the matter we're in the dark really, pretty poor lack of communication for early game with active forums which the devs do post in, you would have though that this game would have been SLI tested and ready by now or at the very worst as it's a pretty big problem for many of us someone would have commented by now. Sometimes I can't help but think that all the useful discussions and news on what the devs are working on fixing etc are taking place in the closed WMD forums leaving us lot out here just going round in circles with each other with nothing but guesswork to by.

Of course the whole poor performance in the wet thing is a moot point anyways as the AI don't seem to be affected by the wet so it's almost pointless racing in those conditions anyway. What with that and the Time Trials and Community Events being plagued by corner cutters and extreme 1-lap tuners and the public online being full of rammers, sometimes there's no point racing at all... I REALLY wanted to like this game but as it is I don't really find myself that motivated to start racing in any of the aforementioned categories for those reasons already stated.

MABlosfeld
20-05-2015, 19:19
My PC is simple but the situation is similar, we decrease some things in the VISUAL and worsen frames, I increased almost everything and active AA and frames better, wtf?
I would like to share with you my views on this curiosity above: marketing.

Traummann
23-05-2015, 13:32
Project Cars is beautiful on windows 10 with SLI.
Now with Build 10122 the graphic performance increased.

Graphic settings are on max. res. is 4k.
Playing with vsync now ( no tearing ), always 60fps.
no fps drops like on win7.

http://images.akamai.steamusercontent.com/ugc/536271942178085560/8DC8F186FF5AF341F4FABCB5CF940385E9B82EF1/
http://images.akamai.steamusercontent.com/ugc/536271942178086483/B2100FF5561F89F13B1E70D575E627590C6B3A38/
http://images.akamai.steamusercontent.com/ugc/536271942178087457/E325BA125F87FE67BD90E13253A9E57A8F2256B2/

note: vram usage is wrong on win10.

game never crashed with win7 or win10.

E30_Hntsvl
23-05-2015, 14:38
I dumped my SLI setup. 2x 780's not able to maintain graphics on high is nuts, and the continual micro stutters on a 2x 980 SLI just sucks. To be fair, Assetto also blows on SLI. I replaced the SLI setup on both rigs and went with single 980's. Micro stutters are gone, game is still a resource hog, but its better.

jrp
25-05-2015, 02:59
Same SLI problems as the rest of the guys here...

All settings maxed at 3440 x 1440, frame rates anywhere between 30 and 100+ depending on track and conditions. System specs in sig.

204362

lollygag
25-05-2015, 07:40
Same SLI problems as the rest of the guys here...

All settings maxed at 3440 x 1440, frame rates anywhere between 30 and 100+ depending on track and conditions. System specs in sig.


SLI works perfectly and has for 2 years now. I'm currently using nVidias Project Cars profile but previous to that I used my own and MrPix SLI profile as well

All 3 gpus have the same usage 80-100%, 8120x1600, framerate capped @ 58fps

204373

Ripgroove
25-05-2015, 19:31
It's clearly not working for everyone. Sure if your rig is maxing it out with capped frames then you would expect 80% GPU usage as you've already maxed it out and capped your frames so there is nothing left for the GPU's to work for to try to achieve, but there are plenty of us who are seeing 80% GPU usage while still not maxing it out, without frame caps or maintaining 60fps, and in this situation our GPU's should be at 99% as there is still plenty of work left to do, but they are not...

ezerivas
26-05-2015, 05:51
Fx8350@ 4,7ghz
2 x gtx 780 amp!

Same issue... Poor performance

FlyingScotsmanSK
26-05-2015, 13:28
Hi I thought I would bump this to the top as no one seems to be doing anything about the SLI issue many people are having
I am having major SLI issues game will start on 60fps with 99% load on both Gpu's then it will drop to 30-40 FPS with 40-50% GPU usage.
ALT/TAB sometimes fixes this but not all the time.

System is Asus Rampage IV with 4960X @4.6Ghz 16 Gig memory@2133
Titan Black SLI@1.2 Ghz all under water.
Windows 8.1 on 1tb Samsung SSD
Running Acer Gsync 4K monitor.

Cuba
26-05-2015, 14:22
How do you explain the GPU1 usage @ 95% and GPU 2 usage @ 12%. Is this normal? I see other posts where both GPU's are running around the same usage. I'm using 2 NVidia GTX 970's.

Ripgroove
26-05-2015, 14:29
How do you explain the GPU1 usage @ 95% and GPU 2 usage @ 12%. Is this normal? I see other posts where both GPU's are running around the same usage. I'm using 2 NVidia GTX 970's.


In this game both my GPUs run about the same (varies from 40-60% most of the time). I do have another game though where GPU1 runs at 30-40% usage but GPU2 sits at 0% with the odd spike to 10%! Not really sure why but just thought I'd mention that it does seem possible for them to be running different to each other.

FlyingScotsmanSK
26-05-2015, 14:55
How do you explain the GPU1 usage @ 95% and GPU 2 usage @ 12%. Is this normal? I see other posts where both GPU's are running around the same usage. I'm using 2 NVidia GTX 970's.

No this is not normal both should be the same, unless you are capped at a certain FPS but perfect SLI scaling should see both card performing the same.

Cuba
26-05-2015, 15:03
No this is not normal both should be the same, unless you are capped at a certain FPS but perfect SLI scaling should see both card performing the same.
That's what I thought too. Last week this game took a real nosedive with FPS. Before last week, this was running smooth with most settings in Ultra (not sure what FPS was at that time because I didn't care; it ran great!). Last week, something happened and now I'm monitoring FPS and lowing graphics just to stay at 60FPS. Anything significant happen last week with NVidia or PCars? Thanks!

MrPix
26-05-2015, 15:29
No this is not normal both should be the same, unless you are capped at a certain FPS but perfect SLI scaling should see both card performing the same.That's very true and correct :)

From my experience, here are some things that make GPU usage non-uniform / uneven in dual SLI enabled setups in particular, so in order of likelihood for pCARS:

1. Overheating of top card causing throttling of GPU speed/voltage, usually from transference of temp from bottom card (8°C to 12°C above the bottom card which is normal behaviour when 'on air cooling' as heat rises naturally) - can cause SLI to disengage in flight.
2. Breach of GPU's theoretical TDP causing the Graphics card to panic and induce throttling of GPU speed/voltage, this only needs to happen for a fraction of a second before fail-safe is brought in and can cause SLI to disengage in flight.
3. No SLI profile in drivers (there has been for a few months now, so unless you are on really old drivers or 'dirty install of drivers, should not be an issue) - SLI will not be engaged at all.
4. No in-game support for multiple GPU (usually responsibility lies between game devs and graphics driver elements) - SLI will not be engaged at all.

vSync and frame limiters can cause low GPU usage (as they should), but this will show as a uniform drop across both cards normally, unless one of the above is in play.

For example, in the case of @jrp's screenshot, it looks to me like the max TDP may have been breached and GPU2 has gone in to fail safe mode as the GPU2 speed has removed the OC and gone to stock and Voltage has dropped to stock too. In reality, when cooling is not the problem, this is the #1 cause for poor performance on SLI and is misunderstood greatly. TDP is not how hot the GPU is, but how much power (volts x amps) it can take in theory and how much cooling would need to be applied to keep it there. It's a limit written in to the firmware to protect the GPU's circuitry by the designers. It can of course be overwritten with a custom BIOS which can increase the TDP and therefore the GPU will not throttle so early.

Hope this helps.

FlyingScotsmanSK
26-05-2015, 15:36
That's very true and correct :)

Form my experience, here are some things that make GPU usage non-uniform / uneven in dual SLI enabled setups in particular, so in order of likelihood for pCARS:

1. Overheating of top card causing throttling of GPU speed/voltage, usually from transference of temp from bottom card (8°C to 12°C above the bottom card which is normal behaviour when 'on air cooling' as heat rises naturally) - can cause SLI to disengage in flight.
2. Breach of GPU's theoretical TDP causing the Graphics card to panic and induce throttling of GPU speed/voltage, this only needs to happen for a fraction of a second before fail-safe is brought in and can cause SLI to disengage in flight.
3. No SLI profile in drivers (there has been for a few months now, so unless you are on really old drivers or 'dirty install of drivers, should not be an issue) - SLI will not be engaged at all.
4. No in-game support for multiple GPU (usually responsibility lies between game devs and graphics driver elements) - SLI will not be engaged at all.

vSync and frame limiters can cause low GPU usage (as they should), but this will show as a uniform drop across both cards normally, unless one of the above is in play.
For example, in the case of @jrp's screenshot, it looks to me like the max TDP may have been breached and GPU2 has gone in to fail safe mode as the GPU2 speed has removed the OC and gone to stock and Voltage has dropped to stock too. In reality, when cooling is not the problem, this is the #1 cause for poor performance on SLI and is misunderstood greatly. TDP is not how hot the GPU is, but how much power (volts x amps) it can take in theory and how much cooling would need to be applied to keep it there. It's a limit written in to the firmware to protect the GPU's circuitry by the designers. It can of course be overwritten with a custom BIOS which can increase the TDP and therefore the GPU will not throttle so early.

Hope this helps.

Mr Pix,

Are you aware of a fix or any upcoming patch to fix this SLI nightmare, As you can see from my sig I have more than enough horsepower to run this game @60hz 4K, when it does run it runs beautifully, but when it drops to 30-40FPS and 40-50% Gpu usage it's a total pain.
Any help would be greatly appreciated.

Kev

MrPix
26-05-2015, 16:00
Mr Pix,

Are you aware of a fix or any upcoming patch to fix this SLI nightmare, As you can see from my sig I have more than enough horsepower to run this game @60hz 4K, when it does run it runs beautifully, but when it drops to 30-40FPS and 40-50% Gpu usage it's a total pain.
Any help would be greatly appreciated.

KevNo sorry, I don't work for SMS. I'm just a bod like you trying to help explain things.

As long as you are not using any form of vSync in game or outside of it, and you are giving the GPUs something to work on, they should be flying at 85-99% all the time... providing they are not being throttled.

Before I started to log all my GPU stats and usage, back in the day when I had SLI, I thought it was the game to blame all the while... whatever the game was... all the older games never had the issues... just the new ones!

Once I started to analyse the logs, I found tiny instances where the Thermal trip had been switched (prior to going sub aqua) or the TDP had been breached thus causing throttling. If the 'blip' is big enough it can affect both cards.... but if you are on air then the top card usually gets blipped first as it is already a lot hotter so the TDP limit is a lot closer to breach.. under water however, it's usually both cards that get throttled. If the thermal trip is intact then the throttling may sometimes be very temporary, but the throttling remains on in most cases. Of course, if you alt tab out and back in again, then the GPUs switch to 2D mode and back to 3D mode and the trip is reset, and performance climbs until it is tripped again.

Project Cars is a very demanding game indeed and can cause the GPUs to work very hard when coming round a corner to be met with the stadium and the pit lane and the pit wall and with crowds and and and... and all of a sudden the demand to render the objects rockets... this can be the moment when the TDP is tripped.

I know it sounds like I am obsessed with TDP, but since the 580's I had in SLI, it has always been the issue. Once I have added a custom BIOS (I have been under water since I got 2 580's and the top card kept hitting the thermal trip) and upped the TDP out of the way as I know I won't hit any thermal barriers in practice (I'm under water), so why should I have them imposed on me in theory (firmware).. The cards remain at the clocks and voltages I put them at when under load.

Don't forget, TDP is not what the card is actually doing in practice, it's a theoretical limit: Temp & Power Draw (voltage/current) and theoretical cooling in a equation. When overclocking, the voltage usually is increased and also the current used will be too so it will be a greater multiplier against the theoretical cooling temperature thus hitting the TDP limit faster. If the TDP limit is upped, then most likely will not be reached so easily.