Go here to test your card for glitches:-
Dowload the Real-Time High Dynamic Light Range tool, let it run for a while on the highest settings your system can allow.
If you see any serious artifacts after like a few seconds of it running (and yes, it is very pretty to look at
) , then your GPU is indeed getting too hot by the sounds of it. If you run it in a windowed mode, make a note of your temps. My 6800 GT can get up to 91 Celcius and above
, but I've never had these kind of problems before...
Hope it helps.
EDIT: You do
have DirectX 9.0c installed, don't you?
Oh, and as ApM said there's new Forceware drivers out now, 66.93 were a waste of space IMO- I found I could never run any video file/DVD in fullscreen without playing around with my desktop's refresh rate...