I'm pulling my hair out on this one.
Windows 7 Home Premium
Asus Crosshair Formula V
Athlon X6 1090T cooled with Zalman CNPS9900Max
G.Skill RipjawX DDR3 1600 16GB (F3-12800CL9Q-16GBXL)
MSI Radeon HD6950 Frozr II
Corsair 64GB SATA III SSD boot
Western Digital Cavier 1TB data
Antec 900w High Current Gaming Series
Sometimes when I boot up the PC, the resource monitor/system properties reports a full 16GB of usable RAM. Sometimes it will crash shortly thereafter, and when it reboots, I'll have 16GB (7.96GB usable). It seems to be completely random, as sometimes when I boot up it starts with the 16/7.96, and other a full 16 but being completely stable; until I shut down/restart, then it will lock up after BIOS splash, and come back on with 16/7.96. I've updated driver, flashed the BIOS, enabled/disabled memory remapping, manually changed RAM settings to firstname.lastname@example.orgV 9-9-9-24 and even tried email@example.comV 8-8-8-24. Still completely sporadic and ridiculous. A few times the BIOS reported 8GB of installed memory, but had all 4 DIMMs listed at 4096MB. I thought the sticks were bad, and tested each one individually, booted and ran memtest with all 4 with no errors/problems. I'm completely out of ideas, does anyone have any advice?
If you need screenshots of any diagnostic or settings please let me know.