I've just installed the Revision B3 P8P67 Deluxe motherboard from Asus, replacing my B2, and now it wont post with all my RAM in place. I have 4x4GB DDR3 1600 RAM which worked fine on my old board but the PC will only boot if I use 8GB in slot 1 and 2. If I fit all 4 cards it brings up post error 3B (or 38). I've swapped them around and reset the CMOS but it still has the error. Anything in slot 3 and 4 stops it from posting.