I don't know for how long this has been going on, but my BIOS only detects 4GB (2x2GB) out of 8GB (total of 4x2GB). CPU-Z tells me I have 8GB of RAM installed and Windows tells me that I have 8GB (4GB usable). I have a 64-bit Windows 7 OS.
I've tried to take them out, dust them off and put them back in again.
- CPU: Intel Core i5 760
- MOTHERBOARD: ASUSTeK P7P55D-E PRO
- RAM: 4x2GB Corsair XMS3 DDR3
- GPU: AMD Radeon 280x
Edit: the problem solved itself out of nowhere