CS:GO resolution problem

[n1ghtmaressjj]

I overclocked my monitor to 75 hz and CS:GO doesn't recognize it. Worked perfectly till today when i switched the resolution trough my nvidia control panel.Usually when i want to switch the resolutions in game ,I just make another custom resolution with 75 hz and play without a problem.That happend when i switched to streched on black bars,but i did that in past and nothing happend worked perfectly.

 

[n1ghtmaressjj]

Well i found the problem,the 75 hz refused to work with MSSA on,any thoughts on how to solve this?