Just got my card about 5 days ago, I've been running it at stock speeds and already on 4 occasions have gotten this error.
Had to yell at the guy @ XFX Customer support to RMA my card he tried to tell me it was my brand new Antec 480w Truepower P.S. that was the problem
and yes I did connect the power to the video card. He even argued if it didn't happen during bootup then it wasn't the card. I asked him "how could it happen it bootup if its only happened 4 times in 120hours and only 2mins of that total was spent in the boot-up screen" Whatta dumbass.
Anyway just wondering if this was me or if anyone else was having problems.

Had to yell at the guy @ XFX Customer support to RMA my card he tried to tell me it was my brand new Antec 480w Truepower P.S. that was the problem
Anyway just wondering if this was me or if anyone else was having problems.