I've come to the conclusion that I'm doing something wrong here . No matter what I try I cannot get a POST over 450 fsb , 450 runs prime fine and 460 , 475 , 500 = no POST . Using the same X3360 and a 780i I was getting into vista @ 3.992ghz but no higher and prime wouldn't even run , it ran at 3.88ghz prime stable for about 5 days before the board died . I'm using latest bios from Asus site , any help would be great .