I have 8 GB (4x2GB sticks) installed but BIOS only detect 4GB installed rather than 8GB I expected. I have reseated all 4 of them, I have rearrainged them, BIOS seems to only detect 2 sticks. If I run CPU-Z it does show all 4 sticks for 8GB total. Windows and BIOS however report only 4GB. Windows 7 64-bit (yes, 64 bits I checked it) Intel 2700k Asus P8P67 Pro (uses UEFI rather than legacy BIOS) Either one of the slot is bad or there's a setting in BIOS that may be inadverantly disabling one set of slots. Anyway to check on that?