P5Q-E: memory setting in BIOS

Ok I just picked up a P5Q-E in the classies and I'm lost as to how the memory dividers work. How in the world do you set the RAM ratio. I'm playing with OC'ing an E2160 (or something like that) I had lying around and I don't know how to keep the ram at reasonable speeds.

Edit: never mind finally figured it out, I got to frustrated last night and just gave up, took all of 5 seconds to figure it out today lol.