Hello! So i came across this problem that i can not solve my self.
I just installed new parts to my pc that are listed below
Motherboard: Asus M5A97 r2.0
Cpu: Amd Fx 8320
Ram: Kingston hyperX Fury 8gb (1x8) 1866mhz cl10
After fresh install of windows 8.1 pro, i only have 3,4gb of ram usable...