Recently added another 6gb of ram to my x58 system. 12GB total. Windows and BIOS selectively choose to show only usable 10GB at times; however MemTest86+ and CPUz have verified all 12GB. I've read about this online sounds to be rather common.
The even weirder part: I have two OCZ SSD in Raid 0 as my OS boot. When 10GB of ram is visible to windows I have 19 gigs left on my C drive. When 12GB of Ram is visible to windows my C drive drops to only 17 gigs available to C? Unrelated I think not.
Any thoughts? Sounds like windows is having some allocation issues. Please Post.
I just turned off my Page file: All 12 gigs of ram are showing in windows, my Local Disk C capacity also went back to 30 gigs of free space. Gotta love it.