I've purchased a used Sapphire R9 290x from a professional coin mining operation to replace my four year-old 6950. There seems to be wide differences in opinion regarding the quality of these mining op cards, whether they're more prone to failure than others. Thought I would post a few thoughts here about my experience as there isn't much first-hand information available out there , just lots of conjecture and anecdotal information. The card was reportedly used for 4 or 5 months in a professional mining data center, according to the seller. Tough to verify for sure, but they provided pictures of the data center and had good ratings on ebay. The guy selling it had more than 10 cards to sell, all the same make and model, so I felt pretty good about it. It was reportedly not overclocked, which is impossible to verify of course. Cost me $240 shipped. It was delivered as described: very clean. No noticeable damage or even dust. I've had the card since Friday, and have logged about 10 hours of gaming in the evenings and ran a few stress tests on it. Operationally, it seems good so far. No obvious memory problems or artifacting. It runs hot, much hotter than I'm used to. I've gathered this is pretty standard for stock 290x cards without any after-market cooling. It idles at around 46c on my rig, but can reach into the 90s during extended use. I've bumped up the fan speeds to 60%, just to be on the safe side. That seems to keep it under 90c, but it isn't quiet. I may pick up something in the line of aftermarket cooling, if I can find something cheap. If anyone else has one of these cards, or other used cards, please post observations from your experience. It may help others looking to buy such cards.