Monitor your card's temperatures if yours supports that. If it's within spec, you should have the same issue. I had an ATI Radeon 9800 Pro that actually physically blew the fan motor off of the heatsink. I noticed because it started artifacting and performing poorly after a few minutes of gaming. Replacing the fan fixed it. Out of all the cards I've had in multiple systems over the last 10 years, it is the only one that's "blown up" like that or like yours.