Lowest input lag settings in FPS games, G-Sync, FPS cap

Discussion in 'Game Tweaks and Modifications' started by darasuu, Jun 27, 2021.

  1. darasuu

    darasuu New Member

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    GPU:
    RTX 3070
    I've read a lot on the internet, and am still confused why does limiting FPS add input lag?
    Say there's a 144Hz monitor and a decent GPU RTX 3070.

    Why does this option:
    Vsync off, G-Sync on, FPS limited to 140Hz in Nvidia Control Panel

    yields higher input lag than this option:
    Vsync off, FPS unlimited, G-sync off (though the latter doesn't matter much)
    ?
    I get that "higher fps" means lower input lag, however, if the monitor can't show more than 144 frames, why is it that there's lower input lag if in CS:GO you get 400+ FPS as compared to when you simply cap the frames to your monitor's refresh rate and get a steady amount of 144FPS (or slightly below)???
     
  2. RealNC

    RealNC Ancient Guru

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    GPU:
    EVGA GTX 980 Ti FTW
    A 144Hz monitor can't show more than 144 complete frames per second. It can show up to 1080 partial frames even in a single scanout (if it's 1080p, where in this extreme case each partial frame would only one line of pixels), let alone in one second. This means it can display 155 thousand partial frames per second (1080 * 144).

    At 288FPS for example, you get two frames at once on the screen. The previous frame is above the tearline, the new frame is below it.

    The higher the frame rate, the more tearlines there are, but the lower the average input lag gets.
     
    Last edited: Jun 28, 2021
    BlindBison likes this.

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