http://www.tomshardware.com/reviews/bios-a-z,1200-11.html toms has good guides on it.
Its really as easy as navigating the bios to the memory section and changing the timing settings to manual mode. Then adjust to match the setting for the ram. These numbers are your major timings you are concerned with the others use either default values or automatic settings: 10-11-10-30 which break down to CAS 10, rRCD(RAS to CAS) 11, tRP 10, tRAS 30 your ram should also be 1T memory if you see a setting for it.
-Andy