I do not know the manual settings I have 2x2 gig g-skill ram and gigabyte says that you need 1 gig modules to run stable on my Gigabyte GA-MA790GP-DS4H, could you please. I took my computer to a shop and they could not manually change the ram, However I would be very happy if some one could help me tweak my bios setting for the Phenom ii 955 OPN: HDZ955FBGiBOX