Try..
Open "System Configuration". (Windows + R), type in "msconfig" and press OK.
Under "Boot" Tab click on "Advanced Options" and check "Maximum Memory" and select 32768.
Press OK and Apply.
Reboot.
Additionally, if you have tried to OC using easy tune, or manually in BIOS, or set up BIOS profiles, please delete existing profiles and reset your BIOS to default. Then set up from scratch. See if that helps.