Lol, you should be fine with it. It's funny how he doesn't make some kind of profit on it. At least sell it to you for $50 or something. What a nice friend.
a free 7900gtx wow. i wish i had friends like you. even if you are caught WHICH you will not be because it is impossible to be, you tell the cops i bought it off some guy. lying is easy
You'll be fine. Your video card is designed to display video and graphics, not be a GPS chip for the authorities. Becides, the serial number is on the card, but it's not 'inside' the card.
Haha, you're just being too paranoid. If you worry too much, I'll take the card off your hands. Just kidding.