Ok. I have a ASUS - P8Z77-V DELUXE, i3570k, 2 x 4gb ddr3 1333 corsair value select ram, win7 64bit. Running with normal settings in bios the system runs fine(tested with prime95). No bsod's or memtest errors. When I run with optimal settings i get bsod 124 and memtest86 unexpected interrupt halting errors. Any help to solve this problem would be greatly appreciated.