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Thread: GTX 1080 Throttling to Base Clock in Project Cars VR

  1. #1
    WMD Member MuddyPaws73's Avatar
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    GTX 1080 Throttling to Base Clock in Project Cars VR

    Is anyone else experiencing their GTX 1080 throttled back to base clock setting when running PCars in Steam VR?

    I've read a few similar cases on the steam discussion boards and one person had success going back to driver 368.39. I reverted back to 368.39, but that did not solve the issue for me. Also, this is not an issue when running PCars outside of VR (at least for me).

    Any suggestions?

    (I'm using the Vive Headset)
    Last edited by MuddyPaws73; 09-07-2016 at 00:08.
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  2. #2
    WMD Member Sampo's Avatar
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    Have you tried to set the Power Management Mode in the driver to 'Adaptive' or 'Prefer maximum performance' ?

    The new default setting 'Optimal power' in the drivers seems to cause some hiccups.
    CPU Intel i7-9700K @ 4.8 GHz | Motherboard Gigabyte Z390 Aorus Pro | RAM 16GB DDR4 3200MHz | GPU nVidia GTX980 4GB (418.81) | Audio Realtek 5.1 on MB | Screen AOC U3477PQU | OS Windows 10 Pro 64-bit | Wheel Logitech G27
    In-game settings: 2560x1080 / 3440x1440 | Texture Resolution HIGH | AF 16x | VSync ON | AA None | Reflections MED | Envmap MED | Vehicle HIGH | World HIGH | Shadows MED | Motion Blur NO | Render Frames Ahead 1 | Particles MED/MED/MED

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  3. #3
    WMD Member MuddyPaws73's Avatar
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    So, a little more testing suggests that in order to get 90 FPS, the visual settings have to be pretty much at low. These settings appear to be not very demanding on the gtx 1080 and it throttle backs to base clock settings.

    If you raise the visual settings, it appears it puts more of a demand on the gpu and the clock timing raises above base. However, it also lowers the fps to 45 (reprojection).
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  4. #4
    GT5 Pilot mr_belowski's Avatar
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    What are you using to measure the clock speed? And does using the high performance power management option make any difference? How about adding the "renderTargetMultiplier" : 2 to the steamvr.settings file to force super sampling?
    Crew Chief details here http://forum.projectcarsgame.com/sho...r-for-PC-users
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  5. #5
    WMD Member MuddyPaws73's Avatar
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    I'm using Afterburner and sending everything to a log file. There are so many variables its almost unmanageable, with the variations in visual settings, tracks, number of cars, weather, etc.
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  6. #6
    Superkart Pilot
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    try to optimise your fans in the case.
    maybe the heat cant come out and heating up the inside, then the GPU clocks down really fast.
    i got an 140mm fan on the side blowing inside and 2x 120mm on he top blowing outside.
    so the GPU can run all the time with its max clockspeed.
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  7. #7
    GT5 Pilot mr_belowski's Avatar
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    Hmm... I'll try that log thing too, see what mischief my 1080 is up to. I have an almost identical setup to yours, but an i5 4690k instead of an i7
    Crew Chief details here http://forum.projectcarsgame.com/sho...r-for-PC-users
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  8. #8
    WMD Member MuddyPaws73's Avatar
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    The GPU never gets above 60 C, even during OC operation.

    I would be very interested in your results.
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  9. #9
    WMD Member Ramjet's Avatar
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    My Gpu is running 68 to 72 deg C when boosting @ upto 2126mhz - Giga 1080 G1 Gaming - but I think the Optimal power setting does throttle it back. Seems to be only the latest Nvidia driver update since it started to do this as it has run for hours at those temps before with no issues. Measured using GPU-Z.

    QUESTION @mrbelowski What is the file to edit to get the pixel density to stay at 2.0 ? I have been manually setting it using the Oculus Debug Tool but would be nice to set it permanently... actually I have it set to 1.7 and force SMAA on at medium.
    Last edited by Ramjet; 10-07-2016 at 08:41.
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  10. #10
    GT5 Pilot mr_belowski's Avatar
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    Righty, just tested and with the 368.39 driver it all works as it should - boost clock activates in game and stays active. I didn't install the newer driver, perhaps it's done something weird.

    The render target multiplier is in some steam folder, in text file steamvr.settings, but it only applies to vive
    Crew Chief details here http://forum.projectcarsgame.com/sho...r-for-PC-users
    Website, download link and forum: http://thecrewchief.org
    Or make a donation, if you think the chief needs to drink more beer:
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