So I'm glad I found this thread. On ebay I just purchased a MSI Graphics Card Radeon RX 580 Armor 4gb OC to replace the 670 Windforce 2GB in my sons PC. I got a really good deal on it, $100 to my door. In the listing he stated he was just upgrading his computer and it was only 8 months old. He also has a motherboard and RAM for sale as well, so that somewhat checks out. I also emailed him and stated I still wanted it either way, but please let me know if it was a mining card so I would know how it was previously used. Once again he confirmed it was only for gaming. Now, obviously there is a chance that he could be lying, so I'm going to test it as if it were a mining card. So I'll run some benchmarks on a loop, maybe furmark. In my possession, this card will not be overclocked. Any advice on the best way to test it / determine that it should last? What's a normal temp for these guys? It will be in a Coolermaster Elite 130 case, so there is no fan next to the GPU, only a vent.