I just put a new box together. I7 930, Asus p6t, 3x2 gb G Skill DDR3-1600. I've manually set timings to 9-9-9-24 and manually set 1600 mhz. I've tried all 3 sticks in all 3 slots, and updated the bios. I've also re-seated the CPU and checked the socket as I've read that that is sometimes the problem.
No matter what, BIOS reports 4 gb, and windows (7 x64) reports 4 gb. CPU-Z reports 3 sticks of 2 gb, all running at correct timings and speed. Anyone have any idea how I can get these to show up in bios?
Update: I pulled the processor again and found a bent pin. I put the pin back into position, powered up, still 4 gb. I pulled the cpu again and found that one of the contacts on the cpu was tarnished looking. I buffed that up and put it back in, still no dice (original bent pin looked straight on the re-pull too). I'm going to pull the cpu again I guess, but I've thorougly checked that all pins and contacts are clean/straight, so i'm not quite sure where to go from here if I don't find anything.
Yeah, I'm really not an expert on it. (Fortunately my i5 worked fine). It is always possible that something got damaged. If after another look you still can't find it, might want to RMA at least the board.