Hello guys. I have a Mitsubishi Diamond Pro 2020u and whenever I turn VSync on for any game (HL2, WoW, NFSU...) it shutters like the hard drive is being thrashed. This happens arbitrary and sometimes it becomes almost like I am playing at 15fps. However, when I leave it off, the games run fine. Is this a problem with the monitor I am using? Or is it video card (BFG 6800GS @ 43c-55c temp 405/1150, fast writes off) related?