I run Tri Channel 1600 Corsair Dominator, 6x 2GB RAM. I've been running 6 gigs and had no issues, and all the memory was read, now after I installed the 12 , System Properties in my computer says only 4.99 GB usable out of the 12GB. Please help. DXDIAG also reads the 12. Task Manager only shows 5.111 gigs. Im sort of new to BIOS features and all, but I think I can find my way.