cause random computer lock up , if there be any audio while this occur , it will loop continuously until you do a hard shutdown . even with this problem , on some occasion I can still play game without lock up . seasonic 560w i5-3450 @ 3.1 Asus P8H77-M pro sapphire radeon hd 7850 Kingston 2x4gb ddr3-1333 Western Digital Caviar Black 1TB Windows 7 64-bit Google these term : Radeon 7970 computer hard lock with sound loop 7xxx Series AMD card : freeze and lock up