What exactly should I be looking for though? As far as a performance increase, my current card is a 7950 GT, so there isn't much of a comparison. I am more looking to make sure that the card isn't in bad condition.
I have used FurMark once before, just to do some overclocking, so I'm a bit familiar with it. Still, what exactly do I want to look at to make sure the card is not damaged. Note, I won't be able to compare to my current performance, as I will be testing it out at the house of the person I am buying it from.