There are 4 values that we're looking at. If I remember correctly, the format RAM is rated at after the MHz is CAS (tCL)-RAS to CAS Delay (tRCD)-Row Precharge (tRP) and RAS (tRAS). Your BIOS is laid out CAS-tRAS-tRCD-tRP following the Timing mode and Memory speed. Your values should be 2.5-6-3-3 if you're following that advice. However, to be honest, you might want to leave them as they stand, since you're going to change one value.
