there's no real great way to make sure it's the card, about the only way to do it is to replace it and see if the problem goes away. if it doesn't then you could always send the card back... you'd just lose a little bit in shipping.
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Intel Core 2 Quad 2.4 ghz
4 gig DDR 2 800
Sapphire Radeon 3870 X2
250 gig Seagate Barracuda
Windows Vista
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