sluggish opengl

[mapel110]

I have a MSI 6800 GT and my opengl-Games run sometimes very slow. about 3-5 seconds per frame. Serious sam2, doom3 and mohaa show this problem. but the problem is gone, when i reboot.
D3D-Games run always fine. NFSU, Sacred, farcry.

i have this problem with FW 61.77 and 66.31

[aAv7]

are you using two monitors? Dual display does that. If your using two monitors, you have to disable one, and performance will improve.

[mapel110]

no, i have only one monitor. If this would be the problem, D3D would run also slow, but it doesnt.