Use bios Saphire 7970 vapor-x 150.037 250 sol no overclock. use the same bios for r9 280x vapor-x downgrade for 250 sol lol. Hynix only. elpida 210 sol max ? bios 15.042 ?? overclock is not possible on system. asrock 970 extreme 4?? only instal 1 gpu possible. i use 5 gpu