16gb installed memory (ram) only 2,91gb usable

Alex23xantho

Honorable
Nov 3, 2013
8
0
10,510
I've installed 2x8GB Corsair Vengeance DDR3 1600MHz, when i check at System it says

INSTALLED MEMORY (RAM) : 16GB (2.91 GB USABLE)

What is that and why is that? please help!

my motherboard is an ASUS SABERTOOTH 990FX R2.0