I just got a Benq XL2420T at 120 Hz, in many games if I go to fullscreen my framerate caps at 60 fps no matter what I do ( Max Payne3, FIFA 14, Bioshock Infinite, etc ).. specially if I enable vsync. If I switch to Windowed mode I get my 120 fps again but my performance is not the same so I need to fix this.
If I play with no vsync I get a really annoying screen tearing most of the time.
How can I fix this problem?
PS: some other games have no problems at all, I set vsync and I get 120 fps all the time ( Devil May Cry, League of Legends, etc )