high refresh rate monitors.
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Solved by samcool55,
Umm, if you are running at 144Hz, and your graphics card pushes out 100fps for example, everything is fine.
The pc just works as fast as it can and every frame gets displayed as you would expect.
Input lag happens when V-sync is turned on, forcing the pc to turn down the amount of fps produced.
Screen tearing happens when you push out more FPS than the refresh rate of your monitor.
To keep it simple when you have a 60Hz monitor, and you run at 90 fps, it tries to push out 1.5 frames to the monitor instead of 1, but because you can't see 1.5 frame what happens is that you get an image that's 50% a new frame and 50% the old frame, causing tearing.

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