Asynchronous Compute

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by Carfax, Feb 25, 2016.

  1. Stormyandcold

    Stormyandcold Ancient Guru

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    This would partly explain why at highest resolutions we actually see a drop in performance on AMD cards in dx12 games like QB. Makes sense as these cards weren't made for such demanding use of AC.
     
  2. Ieldra

    Ieldra Banned

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    What do you mean by a drop? They probably benefit most from async shaders at high resolutions (provided they have the compute to spare) because pixel shader workload is significantly higher.

    On the other hand at low resolutions and higher framrlerates there are more likely to be geometry bottlenecks stalling the pipeline, and async shaders can make use of that stall time
     
  3. Stormyandcold

    Stormyandcold Ancient Guru

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    Have a look here ;

    http://www.overclock3d.net/reviews/gpu_displays/quantum_break_pc_performance_review/8

    http://www.overclock3d.net/reviews/gpu_displays/quantum_break_pc_performance_review/9

    http://www.overclock3d.net/reviews/gpu_displays/quantum_break_pc_performance_review/10
     
  4. Ieldra

    Ieldra Banned

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    I see what you mean, I think that's actually a memory limitation coming into play for the Fury X. I've seen 5.4GB at max settings 1440p

    Nonetheless results are all over the place, as far as I know this game is vsync locked, so those averages are 60s and 30s and nothing in between.
     

  5. Stormyandcold

    Stormyandcold Ancient Guru

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    Yeah, possibly memory limitations coming into play aswell.

    That temporal reconstruction thing though...we don't need that feature on PC.

    http://w ccftech.com/quantum-break-720p-base-resolution-confirmed-temporal-reconstruction/ (remove space between w and c).
     
  6. Ieldra

    Ieldra Banned

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    Edge blurring is atrocious, looking at hair or dense foliage makes me nauseous
     
  7. dr_rus

    dr_rus Ancient Guru

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    AC load is in no way connected to a rendering resolution.

    The reason why the AC gains may become lower in higher resolutions is because the caches are getting a much higher traffic in them and since AMD's AC is hitting the caches pretty hard (you have to run several workloads on different datasets on the same h/w) the evictions and caches overflows can happen more often when you have more pixels to render. But that's just a theory. It may be that concurrent AC is just completely unpredictable on anything but the card it was specifically tuned for.
     
  8. dr_rus

    dr_rus Ancient Guru

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  9. Ieldra

    Ieldra Banned

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    Depends how much workload is on the compute queues really, but yeah entirely possible

    Easy enough to test if async is being used, gpuview profile
     
  10. dr_rus

    dr_rus Ancient Guru

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    Does it even work with UWP apps?
     

  11. Ieldra

    Ieldra Banned

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    No clue, but it should.
     
  12. -Tj-

    -Tj- Ancient Guru

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    From what I saw by high resolutions is mostly Gpixel fillrate (ROPs) that matters the most, not compute or async..

    Crysis1 was perfect example, this one loves higher Gpixel fillrate. Seen it every time I upgraded my gpu, 8800gts had 13?, 250gts, 25, 780 50, 980ti 110..



    //Btw which FFXIV was tested there by power consumption in another thread? The latest - heaven sward?
     
  13. Ieldra

    Ieldra Banned

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    Yeah but the FuryX doesn't seem rop limited, it tends to perform better at high resolutions generally, relative to the 980ti

    Latest one yeah heavensward, Laithan convinced me to try it for stability testing and I have to agree, better than furmark and certainly better than 3dmark
     
  14. TheRyuu

    TheRyuu Member Guru

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    I believe we see that behavior because the 980Ti is both memory bandwidth starved and has less efficient ROP's than FuryX.
     
  15. -Tj-

    -Tj- Ancient Guru

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    I saw Fury is ROP limited too, that HBM saves it a bit, but overall its still crippled by 64ROPs that's why sometimes 390X comes so close to it.


    Ah ok, well for me personally I noticed it can be a little cpu test, gpu also but not much as idk 3dmark2011 or RE6 or Hardreset @ 4xMSAA (powerlimit whoe). Had this with 780GTX OC too, although I knew its limit 1215mhz and anything higher failed in FFXIV too..

    The best "cpu" gaming test for me was RE5 in dx9 @ 720p & Lp2 dx9 @ 720p, both with custom jobthread >> in my case 8 or if you want to test try 12.
     

  16. Carfax

    Carfax Ancient Guru

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    Fury X isn't ROP limited:

    [​IMG]

    Source
     
  17. -Tj-

    -Tj- Ancient Guru

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    Well it still cant come close to 96 rops with much higher mem bandwidth.. so it is limited - anandtech pov up or down. I saw this in another review..

    Imagine if it had 96, those numbers would be in 50 - 60 gpixel for sure.



    Anyway this is totally offtopic now.
     
    Last edited: Apr 13, 2016
  18. Ieldra

    Ieldra Banned

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    fury x is geometry limited !
     
  19. dr_rus

    dr_rus Ancient Guru

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    In high resolutions, across general landscape? I find that unlikely. Fiji is definitely underperforming for its specs and ROPs and/or MCs seems like the natural place to look for the bottleneck.
     
  20. Vbs

    Vbs Master Guru

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    Good news for Pascal. :)

     

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