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Thread: Project CARS On AMD GPUs - Clarification

  1. #1
    Superkart Pilot Rob Prange's Avatar
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    Exclamation Project CARS On AMD GPUs - Clarification

    For the past few days, erroneous information posted on Reddit and other websites has spread misinformation with regards to Project CARS’ performance on systems using AMD GPUs.

    To correct the wrongful assumptions regarding Project CARS’ performance on AMD GPUs, the MADNESS engine and the degree of involvement from our third-party technical partners, Slightly Mad Studios feel compelled to point out the following facts:

    • Project CARS is not a GameWorks product. We have a good working relationship with NVIDIA, as we do with AMD, but we have our own render technology which covers everything we need.

    • NVIDIA are not "sponsors" of the project. The company has not received, and would not expect, financial assistance from third party hardware companies.

    • The MADNESS engine runs PhysX at only 50Hz and not at 600Hz as mentioned in several articles

    • The MADNESS engine uses PhysX for collision detection and dynamic objects, which is a small part of the overall physics systems

    • The MADNESS engine does not use PhysX for the SETA tyre model or for the chassis constraint solver (our two most expensive physics sub-systems)

    • The MADNESS engine does not use PhysX for the AI systems or for raycasting, we use a bespoke optimised solution for those

    • The physics systems run completely independently of the rendering and main game threads and utilises 2 cores at 600Hz

    • The physics threading does not interact with the rendering, it is a push system sending updated positional information to the render bridge at 600Hz

    • Any performance difference with PhysX would not be reflected with differences in comparing rendering frame rates. There is no interaction between PhysX and the rendering

    • Overall, PhysX uses less than 10% of all physics thread CPU on PC. It is a very small part of the physics system so would not make a visual difference if run on the CPU or GPU

    • Direct involvement with both NVIDIA and AMD has been fruitful in assisting with the game performance at various stages of development. Both AMD and nVidia have had access to working builds of the game throughout development, and they have both tested builds and reported their results and offered suggestions for performance improvements.

    • Testing of the game with different driver versions has produced a variety of performance results on both nVidia and AMD hardware. This is entirely to be expected as driver changes cannot always be tested on every game and every card, and this is the reason why both companies produce game-specific driver profiles, to ensure that they can get the best out of the game.

    • Project CARS does not use NVIDIA specific particle technology - the system we use is a modified version of the same technology we used on the Need for Speed : Shift and Shift Unleashed games, and was entirely developed in-house. The reason the performance drops when there are a lot of particles on screen is simply because processing a large number of particles is very expensive.

    • In game there are a number of company logos used, e.g. on billboards around tracks. These are simply there as recognition for the work done by those companies in helping to promote Project CARS at a range of events. The companies include :
    - NVIDIA
    - Panasonic
    - Oculus Rift

    Further information on Slightly Mad Studios’ MADNESS engine is available in the „Tech“ section of our official website:

    http://www.slightlymadstudios.com/tech.html

  2. #2
    Moderator Ryzza5's Avatar
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    Thanks Rob. Hopefully this all sorts itself out soon.

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    I am surprised how a lot of people have trouble with the AMD cars since I'm also using an AMD card (HD 5850) and I'm more than happy how the game runs for myself (I'm a very demanding guys when it come down to fps and stuttering). Hope you guys can solve this problem, which I belive it has something with the newest AMD architecture, since my old one seems to cope with the game very well.
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    Superkart Pilot mcarver2000's Avatar
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    I've read that new AMD drivers that are more optimized for pCARS should be out soon.
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    There are new 15.5 beta drivers on guru3d, but I haven't installed them, have no idea if they contain any performance benefits in pcars.

    http://forums.guru3d.com/showthread.php?t=399245
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    WMD Member rbl's Avatar
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    Some people in there are reporting that the download is fishy and being blocked as untrusted. Even Aldo here says so.
    Quote Originally Posted by Aldo Zampatti View Post
    WARNING! My chrome and AV alerted me when I've downloaded those files from Guru3D. I would not trust those drivers just yet
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    They are posted by asder00 who is a moderator and trusted member of guru3d.
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    WMD Member Thomas Heineman's Avatar
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    I think maybee three digdets amd users have less fps than the older generation from what ive seen...could that be the case? Is there any amd user out there that can compete with a 660ti nividia in pcars?

    If so, let all know!
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  9. #9
    WMD Member TrevorAustin's Avatar
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    Quote Originally Posted by Cosmin-Marius Bilga View Post
    I am surprised how a lot of people have trouble with the AMD cars since I'm also using an AMD card (HD 5850) and I'm more than happy how the game runs for myself (I'm a very demanding guys when it come down to fps and stuttering). Hope you guys can solve this problem, which I belive it has something with the newest AMD architecture, since my old one seems to cope with the game very well.
    I've just done a comparison benchmark, with the guidance of the WMD AMD beta tester, with a 290X (with supposedly new drivers, but hoping they were faked) and a 970. Average FPS on the 290x was 42 and the 970 119. Identical settings other than a card swap. So while you might be happy with it, there is absolutely no doubt that the 970 shouldn't be close to 300% performance of the 290x! My eyes didn't see much difference either, and I probably preferred the AMD picture, but add a Rift into that and a 30% plus hit on FPS and it starts to get unpleasant.


    Pcars GTX 970 drivers 352
    2015-05-19 19:13:57 - pCARS64
    Frames: 14374 - Time: 120000ms - Avg: 119.783 - Min: 91 - Max: 154
    2015-05-19 19:20:39 - pCARS64
    Frames: 14320 - Time: 120000ms - Avg: 119.333 - Min: 91 - Max: 150
    Pcars GTX 970 and rift DK2
    2015-05-19 19:45:33 - pCARS64
    Frames: 7054 - Time: 120000ms - Avg: 58.783 - Min: 48 - Max: 72

    Pcars DD Black 290X drivers 15.5 beta
    2015-05-19 20:54:44 - pCARS64
    Frames: 5063 - Time: 120000ms - Avg: 42.192 - Min: 35 - Max: 50
    2015-05-19 20:58:15 - pCARS64
    Frames: 5082 - Time: 120000ms - Avg: 42.350 - Min: 35 - Max: 51
    Last edited by TrevorAustin; 19-05-2015 at 22:22.
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  10. #10
    WMD Member BKGround's Avatar
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    I thought would I post this information and pass on the article

    Project Cars devs slap down accusations of favouring Nvidia owners

    http://www.pcgamesn.com/project-cars/project-cars-devs-slap-down-accusations-of-favouring-nvidia-owners
    Stephen Baysted has posted a number of trailers, enjoy
    PROJECT CARS LIMITED EDITION TRAILER & Project CARS Official Trailer

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    everyone has screenshots that they have made, post 5 of your best here Screenshot Portfolio Thread (post ONLY your top 5)
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