Could be either.
The only true way to test is to use a quality PSU.
Right now I have my Card running at 830/900 on stock bios and voltages. I have ran the fur rendering test for half an hour and benchmarked with the fur rendering thing and 3dmark06 and haven't had any artifacts or lockups while doing it.
By the way, I have been running the fur rendering thing at 1440x900 which is my resolution with 8x MSAA and it hasn't crashed. Is that a good setting to run it at?
I am using a corsair 620watt PSU.
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