this just started yesterday, my games are capping at 50FPS perfectly. i turned Vsync on and off, never passing 50FPS. it doesn't matter if its GTA V or CoD4.
PC SPECS
i5 4590
8GB RAM
GTX 960
Driver Version 364.72
Win8.1
When you say you turned Vsync off do you mean in the game you turned it off or did you go into Nvidia control panel and turn vsync off. Cause in the control panel its forced on.