QUOTE(G0t M4xx 21 @ Aug 28 2006, 11:58 PM)

yeah I too suspect overheating, if its out of warranty (as I suspect) I'd say it would be worth it to open it and replace the thermal compound with Arctic Silver 5 (after thoroughly cleaning off the old stuff)
Sounds like a classic GPU overheating to me.
The above should help you solve your problem.
QUOTE(wingli373 @ Aug 29 2006, 06:49 AM)

fixed the same problem with a heatgun (IMG:
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What is this heatgun trick I always hear about? What do you do? Just wondering.......