Hi guys! So I recently upgraded my GPU from a Gtx 660 to a Asus Gtx 970. I also got a new 600w power supply. However, now the system has lowered my usable Ram from 12 Gb to 6Gb. It still recognizes that there are 12 Gb installed, but theres only 6 Gb usable. There are two 2 Gb memories and two 4...