You could use a program like FurMark to place a very heavy load on the video card. This won't single out the video card, but it can give some tell-tale signs.
If it works ok in Furmark, it probably isn't the card. That is odd it would only do it under no load (assuming that you've tried full load).
You could try another power supply or try the video card in another system to see if it follows. You could also try completely removing and reinstalling the drivers to make sure there wasn't something wrong with them.
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