Monitor Overclocking problem

[MrPopadomz]

I recently overclocked my benq monitor to 75hz, (It says 75 max on the box). But when I go in gta v and put on v sync im getting it locked at 50fps rather than 75? Why is this.

 

[Cons29]

what fps do you get with vsync off?

 

[MrPopadomz]

what fps do you get with vsync off?

Like 80-120