Hey guys, About two weeks ago I sold a 550TI on Ebay, It was only put in a computer to install Windows7 then was taken out. I sold it to someone on ebay, He has come back to me and asked for a refund as the card is faulty, He has told me the memory on the card fails. I had the card back today to have a look over and I have done a stress test for 45mins using Furmark and it all looks ok, Max temp 75 I don't see any problems or faults. I have also played Skyrim on high settings for 2 hours and no problems there either. So How do I go about testing the GPU Memory? Any advice? Cheers.