Since the gpu price bubble is over and prices are coming down, a lot of people are looking at used--many for the first time. There's a bunch of telltale signs I look for in a used car that tell me 'stay away'. But I haven't seen enough gpus to know what to look for in a similar manner. So for those of us that can finally afford a gpu, what can you physcially check on the card itself? What are tell-tale signs in pictures? Of course the specs matter and all that, and the seller and trust are a part of the equation, but in the end it's you and a piece of hardware. I'm sure some advice from experienced sellers/buyers will help us all. Much thanks in advance!