Windows reading my 16GB but "7.95 usable"

widers100

Prominent
Jul 15, 2017
2
0
510
Can anyone please help me with this? I have 3 memory sticks:

One 8GB G.Skill F3-14900CL10-8GBXL @ slot 3.

Two 4GB Corsair CMZ4GX3M1A1600CL9 @ slots 2 and 4 respectively.

On ASRock 990FX Extreme9.

CPU-Z report on MediaFire: