Temporary Freezing with 6800gt
I have an XFX 6800gt and in most games, about every half hour to an hour the game would freeze for 4-5 seconds. The sound would loop and it would completely lock up and then come back. I just bought Brothers in Arms and Silent Hunter III, and in BIA, it never happens, but in SHIII, it happens more than it ever has; so much that it's unplayable.
When it happens, I look at the temperature in the Nvidia control panel and it's at about 86c, and my processor will be at 50-60c.
I had the 6800gt in a old dell computer and bought a new power supply with it (that particular Dell model was supposed to be able to use standard ATX PSUs) and the power supply popped, and could've damaged the 6800gt. After that I just bought parts and built a new computer with the 6800gt.
Since this only happens in some games, it could be a software or driver problem but it also could be that some games stress the 6800gt more.
AMD 64 3500+
1GB Corsair RAM
XFX GeForce 6800gt
MSI Nforce 3 ultra Mobo