809 is one of the worst bios releases have made for this motherboard.
i've went back to 311, and works super with E6600. tested with other CPUs, but the OC is unstable no mater how much voltage you pump in.
+the OC profiles will not work for diffrent bios versions.
on the assus forum i've found the fallowing topic related to manual OC / multiplier.
Cannot set overclock to manual
Can't change my cpu ratio!! using 0809
as usual asus does not show any interest in users problems and offers poor support for them.