Is how Darius mentioned, that option activates the Vertical Syncroniztion.
If i am not wrong, your video card will give you only multiplos and submultiplos of the value you have adjusted as refresh rate into your monitor.
In example, if you have 60Hz refresh rate adjusted into your monitor, your video card output will be in example 15, 30, 60, 120, 180 FPS.
Note if your card is capable to give you 100 FPS it will give only 60 up to it is capable to give 120 FPS
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