No artifacts pc was shut down properly, and tomorrow black screen when i tried to boot it up, card wasnt used for mining or heavy gaming, few hours weekly for light gaming. I will try when i have time to put card in second pci slot, and will try to flash official bios, then i will have some more info like does atiflash recognize the card and if reflashing bios repairs problem. I ruled out Vrm because gpu was heating up, i dont know now if i am right about that, my initial thought was that it was just output problem...