Win7 Professional x64 16GB (4.99GB usable)

Question

I've installed Corsair Vengeance CMZ16GX3M2A1600C10, 2x8GB, DDR3-1600, PC3-12800, CL10, DIMM and my BIOS picks up that there is 16GB, Windows says there is 16GB, CPU-z says there is 16GB. But it only says I can use 4.99GB out of 16GB.

Motherboard is P55-GD65 (MS-7583)

Supports four unbuffered DIMM of 1.5 Volt DDR3 1066/1333/1600*/2000*/2133* (OC) DRAM, 16GB Max

Windows

(Above screenshot specifies that I am on a System type: 64-bit OS)

CPU-z

Microsoft says that the physical memory limit on a 64 bit win7 professional operating system is 192GB.

Dxdiag Run Command

BIOS Screenshot #1

BIOS Screenshot #2

Why is my OS limiting me to just over a quarter of the available memory? is there anyway to increase it?

Answer 1

I fixed it on my windows 7 PC by simply going into msconfig -> boot -> advanced options. And increasing the maximum memory and then running a reboot.