I ve buyed an rx 580 with 4 gb and it worked well 2 days , but there suddenly the GPU just losed performance , i returned and they gaved me another one. Same problem , after 2-3 days this one is losing perfoarmance too , from 100 fps on Wolfensein new colossus to 60 fps and in other games have the same + fps drops. I have reinstalled the drivers and put the power to 50% on wattman but its the same