So I bought an RX 560 4GB PowerColor Red Dragon GPU on eBay used and everything was working perfectly fine. But after a few hours of gameplay, I start getting terrible artifacts and discoloration. Once I let everything calm down for an hour or so and get back to gaming (Paladins, Dragon's Dogma, Dead by Daylight) the artifacts stop until after a few hours of gameplay again. I don't know what could be causing this besides maybe a dying GPU? I checked the temps and with fans cranked to maximum (as I am playing games at 4K and doing so just fine with 40+ fps) the temperatures seem to stabilize around 75C-78C. When idle however, it is at 50C-53C and that is stupid hot for sitting idle. I was thinking that the card itself is just dying but it's a little hard for me to tell. Any opinions guys?