Because I was told that if I have a 75Hz monitor and for example if I play league of legends at maximum settings with 140 fps my monitor will crashWhat do you mean, a problem?
This gpu has hdmi 2.0, and dp 1.4, both of which can run 1080p75hz no problem
So for desktop use you will get 75hz, but while gaming, depending (heavily depending) on the game, you might get 75fps, lower, or higher.
Whoever told you thatBecause I was told that if I have a 75Hz monitor and for example if I play league of legends at maximum settings with 140 fps my monitor will crash