Running half RAM

rushman34

Honorable
Aug 31, 2012
6
0
10,510
I'm running an Asus Crosshair V Formula-Z mobo with an AMD 6-core processor. I just installed 4 4gb sticks of RAM (G.Skill Ripjaws 2133MHz) which the manual says is compatible with the motherboard. The system sees all 16gb but says only 7.9gb are usable. They're seated right so I don't know what is wrong. Any help will be greatly appreciated.