New video card. Cant use all memory slots
Ive been running a 550ti with 16gigs of corsairs vengeance ram for a little over a year now. I decided to upgrade my video card. Went with a 7950 w/boost and since then, I have been unable to use all 16 gigs of ram(4x4GB). I can use any combination of memory sticks to have 8GB so I know each stick of memory works. I have tried each stick in each slot on the mobo as well. Boots fine. I figured the mobo was going bad so I replaced it with a MSI z77a-g45 board. Same issue.
I have updated the bios and even tried other ram(same kind from a friend). The machine wont boot at all. I have to reset the cmos and just use one stick to get it booted up again. Ive tried searching google but I just end up with video card comparisons, and buying ram suggestions. Any ideas?