If you OC the CPU it over clock the ram at the same time. I have a P4 3.2 HT over clock about 5 percent which would make my cpu speed up to only 3.4 I know it a little but it made a big diffence. I did my testing using
everest home edition which is free and did a benchmark test before and after Over clocking and activating the dual mode ram
everest home edition which is free and did a benchmark test before and after Over clocking and activating the dual mode ram