Using multiple tools, I have verified that my computer can "see" that 8GB of RAM is installed, but only is using 4GB of ram. I've seen this behavior with:
- Memtest86+ 4.20: Memory SDP Information shows 2x 4GB DIMMs installed in Slots 0 & 1. CAS timings match BIOS. Also, Ram Clockspeed is at 532 MHz instead to 1033MHz.
- Windows 7 64-bit: System Properties reports 8GB installed, 4 GB usable
- Linux (amd64 kernel) utility 'free' reports 4GB or ram
8GB DDR3 Ram
EVGA X58 SLI3 Motherboard
Windows 7 64-bit Pro
8800GT Video Card
I've verified the proper Slot locations on the motherboard. They are correct according to the manual.