Quote Originally Posted by shazza View Post
I have the same problem regarding "missing" memory on my P6T Deluxe with 3 x 2GB G.Skill 1600MHz. 6GB installed only shows 4GB in Windows (Vista 64) and in the BIOS. CPU-Z shows 6GB. The board runs well otherwise. (Note - it showed 6B for the first few days)

I've seen at least half a dozen posts about the missing memory. Some people have RMA'd the board, or replaced memory and reported success. I dunno
Reseat the CPU in the socket. Look carefully to make sure none of the pins are bent or damaged.