[Official] DX9 vs DX11 performance difference

Discussion in 'Technical & Support' started by 4thworld, May 4, 2017.

Thread Status:
Not open for further replies.
  1. Rony1984

    Rony1984 Registered

    Joined:
    May 10, 2012
    Messages:
    488
    Likes Received:
    23
  2. Ari Antero

    Ari Antero Registered

    Joined:
    Jul 27, 2012
    Messages:
    1,882
    Likes Received:
    825
    There seem to be issue with GPU loads and third party content . If GPU load is higher then 40% game i stuttering a lot and GPU load is never higher then 70%. GPU load lower then 40% is smooth and stutter free :(
    ISI/S397 content seem not to have same issue.
     
  3. Mulero

    Mulero Registered

    Joined:
    Jan 16, 2012
    Messages:
    351
    Likes Received:
    153
    Test day today. I have updated the PC to a I5 7600k but the results are not very satisfactory ... Performance is still far below the DX9 version.

    Before changing the CPU I have done some tests and last build has brought a significant loss of performance in my old system.

    FPS PII 965.jpg
    CPU switching has brought a huge increase in FPS in DX11.

    FPS PII 7600k.jpg
    The improvement in DX9 is very small.

    FPS PII 7600k DX11.jpg

    True disappointment has come when comparing the DX9 and DX11 versions with the new CPU. Average is 20FPS lower in DX11 version.

    FPS 7600k dx9 dx11.jpg
     
  4. Adrianstealth

    Adrianstealth Registered

    Joined:
    May 28, 2012
    Messages:
    4,478
    Likes Received:
    1,004
    this is why i stay away from 3rd p. content , most of it is fairly poor
     
  5. stonec

    stonec Member

    Joined:
    Jun 19, 2012
    Messages:
    3,248
    Likes Received:
    1,371
    FPS is down by a further 5% in build 1905835 compared to the build of last week in all scenarios that I measured. This is consistent with the graphs of @Mulero , the DX11 build was roughly 10-15% behind DX9 and is now 15-20%.
     
    Stan, F1Aussie, SPASKIS and 1 other person like this.
  6. Mulero

    Mulero Registered

    Joined:
    Jan 16, 2012
    Messages:
    351
    Likes Received:
    153
    Finally the performance is similar to the version dx9. Great work guys. It would be nice to be able to test with old CPU, but it is no longer possible.

    FPS.jpg
     
    F1Aussie and demerzel like this.
  7. Emery

    Emery Registered

    Joined:
    Oct 24, 2010
    Messages:
    2,785
    Likes Received:
    1,377
    The lighter the load, the better for fps. Build 1868941 has been best for my triple screens with no PPE enabled.

    settings: Level 4 AA, PPE=off, resolution 5760x1080 multiview, no sync, aggressive threads=off
    system: single GTX 1080, 8 GB VRAM; i7-4770 @3.4 GHz, 32 GB RAM
    view: cockpit camera
    weather: overcast

    Atlanta Motorsports Park, Cobra
    DX9, Avg 88 fps, Min 75 fps, Max 101 fps
    Build 1915820, Avg 85 fps (-3%), Min 74 fps (-1%), Max 98 fps (-3%)

    Palm Beach, Cobra
    DX9, Avg 109 fps, Min 100 fps, Max 122 fps
    Build 1915820, Avg 108 fps (-1%), Min 99 fps (-1%), Max 124 fps (+2%)
     
  8. Adrianstealth

    Adrianstealth Registered

    Joined:
    May 28, 2012
    Messages:
    4,478
    Likes Received:
    1,004
    it must be something at my end , I did switch off gamer mode in windows 10

    I'll turn it back on as now I'm starting to think its not the new build that responsible for a sudden less of PC performance
     
  9. demerzel

    demerzel Registered

    Joined:
    Aug 30, 2015
    Messages:
    197
    Likes Received:
    127
    Maybe a plugin? Crewchief's shared memory plugin cause stuttering for me..
     
  10. helyesadi

    helyesadi Registered

    Joined:
    Feb 8, 2017
    Messages:
    80
    Likes Received:
    52
    I have a low end PC with AMD video card.
    PC spec in settings.zip

    Nola - Indacar
    9 AI car

    (DX9 had a big fps drop, dont know why :O)
    rf2.png
     

    Attached Files:

  11. stonec

    stonec Member

    Joined:
    Jun 19, 2012
    Messages:
    3,248
    Likes Received:
    1,371
    You are likely getting worse results in DX11 because of the high AA level. DX11 AA implementation is very heavy, I wouldn't recommend using anything higher than x1 or x2 at the moment. x5 in DX11 basically corresponds to x15 in DX9 in terms of image quality.
     
    Rony1984 and demerzel like this.
  12. helyesadi

    helyesadi Registered

    Joined:
    Feb 8, 2017
    Messages:
    80
    Likes Received:
    52
    Thanks. I try this. But 4thworld wrote this: Use same graphics settings... (in the first comment)
     
    T.Hartmann likes this.
  13. demerzel

    demerzel Registered

    Joined:
    Aug 30, 2015
    Messages:
    197
    Likes Received:
    127
    Umm yeah. However, for your gpu, this level of AA is way overkill in both versions.
     
    helyesadi likes this.
  14. NunoPinto

    NunoPinto Member

    Joined:
    Jul 13, 2012
    Messages:
    146
    Likes Received:
    59
    Don't know about you guys but rf2 in dx11 at the moment is unplayable to me. I have huge frame drops and stuttering to a point that ruins the gameplay completely. Not even in official content is playable. I didn't try a session alone but whats the point in that? I'm using 5760*1080 in multiview with a 980ti aggressive thread off(tried on, same results).
    Example, in Atlanta MP i have 40 something fps on the pits and on the rest of th track 60 something with a lot of stutering and some dips to the 50's.
    Tried vsync same stuttering and frame drops.
    I used to get a lot more fps than i'm getting right now.
     
  15. Adrianstealth

    Adrianstealth Registered

    Joined:
    May 28, 2012
    Messages:
    4,478
    Likes Received:
    1,004
    5760 x 1080 is a massive resolution, drop it down + reduce some settings
     
  16. Adrianstealth

    Adrianstealth Registered

    Joined:
    May 28, 2012
    Messages:
    4,478
    Likes Received:
    1,004
    latest build my performance is tad down )-:
     
  17. vegaguy5555

    vegaguy5555 Registered

    Joined:
    Jan 28, 2017
    Messages:
    924
    Likes Received:
    495
    Its been spotty for me too but I think it's getting better over all.
    It is miles faster loading now.
     
  18. The Iron Wolf

    The Iron Wolf Member

    Joined:
    Feb 20, 2016
    Messages:
    977
    Likes Received:
    946
    @demerzel - if you are sure of this, and have some time for experiments, feel free to PM me. I am performance freak, and impacting rF2 smoothness is the last thing I want. I did profile (measured) my plugin - it takes less than 0.04% of game CPU time with maxed out grids, and I've not noticed any FPS drop on my old CPU. Also, good news is that new version of the plugin will run smoother (less spikes), but again, at 0.04% process time usage is close to noise boundary, I fail to imagine it having any effect on the game. But of course, joys of PC is that there's so many different hardware and software combinations, so you never know.

    For Crew Chief itself, make sure you update to the latest version (we made improvements) and make sure "load sounds on startup" is checked. Lastly, you can restrict CC to certain CPU by passing param, for example cpu4 (see readme).
     
    Last edited: Jun 30, 2017
  19. Adrianstealth

    Adrianstealth Registered

    Joined:
    May 28, 2012
    Messages:
    4,478
    Likes Received:
    1,004
    I've lowered settings back to previous , performance is still way way better than first VR release & everything looks nice

    Think I'll stop rising settings in future even on a good optimisation update
     
  20. BoothJoe

    BoothJoe Registered

    Joined:
    Oct 12, 2015
    Messages:
    202
    Likes Received:
    8
    I've not noticed anything with Crewchief to indicate it's a resource problem. I've run RF2 with it and without it and I don't see a difference. And I'm sure there's lots of other background tasks running that have worse impact than CC.
     
    F1Aussie likes this.
Thread Status:
Not open for further replies.

Share This Page