If it's the one in his sig it's an XFX. They have a DOUBLE lifetime warranty on their cards. If you bought it new then you're covered and if you bought it from someone else you need to get the transfer code from them for the card.
XFX has always been good to me, I've had a couple of cards over the past few years die on me...always got a working equivalent or better. The last 8800gts I sent them they sent back as a 9800gtx+.