What does FAST Sync do?
Very simply, Fast Sync basically decouples the render engine and display by using a third buffer (triple buffer like)a sort of version 2 adaptive vsync. This method was specifically designed for high FPS games (especially with monitors with high refresh rates), etc. Hence, "FAST sync" eliminates stuttering and screen tearing with high FPS games together with low latency so stuttering could be reduced.
It can be used with any monitor.
NOTE: It can be combined with GSYNC (which works great with the lower frame rates).
The other syncs for comparison:
V-SYNC – The framerate is synchronised to the monitor refresh rate (no tearing, input lag). However, there is increasing input lag as framerate falls, plus frame rate falls to half once the frame rates fall below the monitor refresh rate)
V-SYNC OFF – The framerate is NOT synchronised to the monitor refresh rate (You get tearing as soon as the frame rate falls below the monitor refresh rate, but there is very little input lag)
Adaptive Sync - At high framerates, VSync is enabled to eliminate tearing. At low frame rates, it's disabled to minimise stuttering. (However you do get input lag at high frame rates, and some tearing at low frame rates). It can also be set to work at half the monitor refresh rate.
G-SYNC - Synchronises the monitor refresh rate to the frame rate using a hardware module in the monitor. (This results in no tearing, and virtually no input lag), Wwhatever the gpu renders it is displayed on the monitor, so there is no stuttering at low frame rates. It requires special G Sync Monitors.
Well worth a try for NVidia users and is enabled using the NVidia control panel (vertical sync) for GTX 9xx and 10xx cards.
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