Msconfig, memory remapping atd.https://msfn.org/board/topic/158629-16gb-installed-only-12gb-usable-in-win7-x64-ultimate/https://linustechtips.com/main/topic/745635-16gb-ram-12gb-usable-why/https://superuser.com/questions/583165/16gb-of-ram-installed-12gb-useable