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Nvidia GTX 970

Discussion in 'Assetto Corsa' started by Gorby, Aug 19, 2015.

  1. Gorby

    Gorby
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    Im curious if there is anyone running this card at the moment... and if so what their experience is like.

    I'm having all sorts of nightmares at the moment. For whatever reason the card is only utilizing 20-30% of available GPU in any kind of multiplayer situation (aka lots of cars on track). This severely inhibits my frame rate (:inlove:0fps). In SP/practice situations though it uses what i would call a normal chunk of GPU (80-90%) and the frame rate is awesome (100+).

    Tried just about every variety of setting in the Nvidia control panel. Also tried several different driver versions. Research shows this is a pretty systemic problem with this card architecture and there seems to be almost no resolution put forward by Nvidia in the past 6 months (judging by post age).

    I dont see this being a bottleneck issue with any other component since CPU and Mem usage is all nominal.

    Screenshot examples...[​IMG]
    [​IMG]
     
    Last edited: Aug 19, 2015
  2. Gorby

    Gorby
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    Single player examples

    [​IMG]
    [​IMG]
     
  3. PhilS13

    PhilS13
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    Last edited: Aug 19, 2015
  4. Gorby

    Gorby
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    This is pretty much exactly my problem. After more research I can see only two CPU cores being utilized while the others pretty much idle. Seems to be an AC limitation, but it looks like they will try fix it in the future. Stefano tweeted just the other day they might be close to improve the games multithreading capability (aka use more than 2 cores) so hopefully a resolution is close.
     
  5. RenZ_

    RenZ_

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    I find my frames take a huge dive online when pTracker app is on, they drop from ~280 to ~160 in the pits then drop to around 100 in a big field with it on, it stays over 200 with it off. I have a GTX970 and a 4790K @ 4.5GHz with DDR3-2400.

    Click off pTracker and see if it helps.
     
    Last edited: Aug 19, 2015
  6. Gorby

    Gorby
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    @RenZ_
    I'm fairly certain this is down to the fact that AC is not a multithreaded application, thus it will only ever utilize 2 CPU cores. Because the single core performance of a 4790K is probably significantly stronger than the 4710MQ I have, you can still achieve >60 fps despite this limitation. Even performing tests with bare minimal graphical settings and no apps the FPS differences are negligible.

    Take a look at the thread @PhilS13 linked above for more detail on the problem.

    Kunos will almost certainly have to fix this for the console release, so I'll just have to sit tight until then.
     
  7. RenZ_

    RenZ_

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    I hope they do fix it for your sake, but honestly it is around 100FPS difference sitting in the pits turning pTracker on and off in a league practice session. I am surprised you didn't notice a difference, it sounds to me graphics related.

    As you have a laptop and a GTX970M (equiv to a GTX960 desktop roughly), have you made sure the GPU is running in maximum performance mode properly? if it was a CPU limitation pTracker would change the FPS IMO.
     
  8. Gorby

    Gorby
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    Yeah I made all the configuration changes in Windows and the Nvidia driver to use max performance (aka **** the battery mode). I'll test the pTracker thing again tonight... if it makes a difference like you said then it might be a decent bandaid fix so I can at least play on busy servers.
     
  9. RenZ_

    RenZ_

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    Good luck man. You will be smashing Sun and I once you get some frames :p
     
  10. JoelGL

    JoelGL

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    But is Stefano wrong in saying that cpu multi-threading has nothing to do with the FPS drop?
     
  11. RenZ_

    RenZ_

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    I still believe that is the core issue. Just turning off apps can help is all I am saying.

    No doubt they will get it right for the console release, those AMD CPU's don't have huge single thread performance.
     
  12. Gorby

    Gorby
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    I get how trying to rebuff a statement made by Stefano probably wouldn't go down well... but I fail to see how it WOULDNT have an impact given the current evidence. Not just mine, but other players on the AC forum.

    Also in that thread that Phil linked, another AC staff member did say they were aware of the current problem and are looking into improving it.

     
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  13. Gorby

    Gorby
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    @RenZ_
    Tried turing off ptracter just now and still similar performance (:inlove:0fps on busy session). Same CPU and GPU behaviour
     
  14. Gorby

    Gorby
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    Better side by side comparison of the two scenarios. Left half shows single car on t rack 120+ FPS. right half shows 22 cars on track 25~FPS. You can see in the first scenario CPU usage on the 2 cores is high but not maxed, whereas in the second scenario both are bricked, with thus puts the GPU into some form of panic mode.

    Might attempt rollback to Win7 over the weekend see if there's much difference.

    [​IMG] [​IMG]
     
  15. RenZ_

    RenZ_

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    Bugger. Sorry if I wasted your time.