Vsynch locks the frame rate at 60FPS.
That way you don’t have to deal with the frame rate changing wildly if it tends to go fluctuate wildly over 60 often.
If you have less then 60FPS it will do nothing for you.
Unless you enable the Nvidia half rate vsyc option, i forgot what its called which locks your FPS at 30FPS.
Monitors have a set refresh rate, either 30, 60, or 144 usually.
Most monitors are 60, and fancier gaming monitors go all the way up to 144Hz.
A games frame rate not matching the monitor’s refresh rate can cause what is known as “tearing”.
If this happens often and becomes annoying, enable vsync.
Some people do not like using v-sync because it introduces slight millisecond delays. This is bad for twitch shooters like COD and CS:GO, but should be fine for Evolve in my opinion.
Some games give you the option to just lock the frame rate at a maximum, but since Evolve does not have this I just enbale V-Sync to have a consistent 60FP so my gaming experience is consistent and enjoyable.