Built a new rig couple of weeks ago
os: windows 8 64
ram:16 gb/ four 4gb ram kingston sticks/ KHX2400C11D3/4GX
motherboard: asus x79 sabertooth
cpu: 4930k i7 intel
gpu: 780ti reference card/ asus
psu watage: 1000w
ssd: samgsung 750gb
At first only 3 sticks were detected, so to troubleshoot I turned my machine off and unplugged it and swapped the stick it was not detecting with one next to it. After swapping booth sticks, both of them were not being detected. So I swapped them again to its original position and still both are undetected.