40% Less Input Lag Without AMD Anti-Lag or NVidia Ultra-Low Latency

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by bluedevil, Sep 26, 2019.

  1. bluedevil

    bluedevil Master Guru

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    User Battle(non)sense found that reducing the GPU load below 99% by frame capping significantly reduces input lag (button to pixel delay).
    Anti-lag features only work to reduce lag at 99% GPU load and can actually introduce some lag when below 99%.



    Please watch the video before posting any comments.
     
  2. aayman_farzand

    aayman_farzand Master Guru

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    He didn't test when GPU usage is <99% and FPS is uncapped.
     
  3. janos666

    janos666 Master Guru

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  4. Ejziponken

    Ejziponken Member

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    How do u reduce it to 99%
     

  5. cookieboyeli

    cookieboyeli Master Guru

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    Maybe watch the video to find out.
     
  6. Minotaur

    Minotaur Member Guru

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    Makes sense, so basically just keep your FPS cap just above or equal to your average FPS for better latency. :) I don't think he mentioned that you should, also set your refresh rate as close as possible, just above your FPS cap, if not using G-Sync or Freesync.
    Besides that it depends on the game too. BFV doesn't respect nVidia low latency settings and always resets them here. I just use DX12 with no render ahead in BFV, it works best here.
     
  7. Mico

    Mico Member

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    Or use RTSS scansync over V-sync. It has some limit, but the result is awesome.
     
  8. Agent-A01

    Agent-A01 Ancient Guru

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    And how do you go about testing that?

    Artificially limiting CPU performance by disabling cores?
    That's not realistic nor does it make sense to test.
     
  9. Cyberdyne

    Cyberdyne Ancient Guru

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    You just need a CPU limited scenario. That's not artificial, pretty common.
     
  10. janos666

    janos666 Master Guru

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    At least with old single- or poorly multi-threaded or otherwise badly optimized games and/or when you couple a relatively old/cheap CPU with a high-end VGA card (like some people in the Bulldozer era with those FX CPUs, haha) or when your display is capable of very high refresh rate (like 200+ Hz but at least 144+).
     

  11. MrBonk

    MrBonk Ancient Guru

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    Test Killing Floor. The game is extremely CPU bottlenecked.

    I still can't maintain more than maybe 70-80FPS without CPU related drops in any of the 3 backends the game has on my current setup. (Even when forcing AA). Trying to play at 120FPS feels horribly inconsistent and less responsive than capping at 60FPS without vsync enabled.

    In some situations it can even drop below 60FPS the CPU bottleneck is so bad.
     
  12. Cyberdyne

    Cyberdyne Ancient Guru

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    Are you sensitive to input lag? Maybe give it a try.
     
  13. angelgraves13

    angelgraves13 Ancient Guru

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    That's a rather long video for frame capping.
     
    Last edited: Sep 30, 2019
  14. emperorsfist

    emperorsfist Master Guru

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    I second that. I find it a bit better than the "Vsync + 59.99 fps cap" trick (I lack the means of measuring it, though...).
     
  15. Cyberdyne

    Cyberdyne Ancient Guru

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    So hardware unboxed did a video on this. Their findings are pretty interesting.
    It's heavily game and game engine dependant.
    Lower input lag from frame rate cap only works with in game limiter in some games.
    Games like far cry and the division never see an improvement using in game limiter or rtss, only makes it worse. Both give the same result.
    Rtss sometimes makes input lag drastically worse than in game limiter.

    Unfortunately the end result is not cut and dry, if a 2-10ms makes a difference to you you'll need to experiment.
     

  16. Agent-A01

    Agent-A01 Ancient Guru

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    You mean Killing floor 1 right?

    KF2 is pretty well optimized.
     
  17. Mico

    Mico Member

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    I'm still testing it but so far the result is quite good. You can even cap under the refresh rate on the fly without odd buffering problems and input responsiveness is nice compared to others ways to do it. The limit on my 1070ti is 85%, over that i get huge slowdowns.
    Also seems to be very game (or engine) related.. On UE4 Games internal limiter works the best for me.
    On The Division 2 fractional cap is better (i use 59.994).
    The main use i do of Scansync over Vsync is in cpu-bound games where i can't reach a stable 60 due to cpu usage.. E.g. I can use scanline x/2 on a custom 75 hertz resolution. Image smoothness is on pair with 1/2 vsync but the reduced input lag makes everything acceptable..

    About Ultra Latency: its quite useful for games that cannot be reached by RTSS. It has a backside tho. At least for me it works nice at a fixed framerate.(synced or not) If fps varies too much i experience micro-stutter.
     
    Last edited: Sep 30, 2019
    emperorsfist likes this.
  18. MrBonk

    MrBonk Ancient Guru

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    Yeah. I do.
    Have never played KF2 only KF1. And performance is trash over 60FPS.
     
  19. angelgraves13

    angelgraves13 Ancient Guru

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    Isn't that the case with 99% of games?
     
  20. Cave Waverider

    Cave Waverider Master Guru

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    According to this Australian follow-up video to the on in the top post, it looks like only certain in-game frame limiters do this in certain situations/configurations:
     

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