I'm looking to buy a MSI RADEON RX 580 Gaming X 8GB. The seller says it was used for mining for two months. He has good feedback on ebay. I'm planning to make him an offer of $140 plus $15 shipping. His asking price is $160 plus $15 shipping. I read an article from about two years ago which says that the state of mining is such that GPUs are more likely to be undervolted than overclocked because miners are now focused on stability. I also read another article that says one should do a stress test upon receiving a used graphics card. I already have a MSI Gaming X R270 that I bought used a few years ago and have no idea whether it was used for mining, but have not experience any issue with it.