Not sure if this is a monitor or graphics card issue?
I have MSI 8800GTS OC 512MB and Acer AL2216W 22" Widescreen LCD.
After a few minutes of playing a game at max res 1680x1050, PC will freeze. The only way I figured out to stop the freezing is to enable Vsync in game...but I would prefer to not have to do this because I am limited to 60fps.
I thought it may have been a heat issue with my vidcard, so I used Riva Tuner to jack the fan speed up to 60% and that got my GPU atleast 10 degrees cooler, but that didn't help my situation.