If you decide to OC make sure to raise your FSB(Front side bus) by small increments, like about 3-5 each try... You basically raise your FSB for extra Mhz and for timings you raise votage and latency... To do timings raise voltages by .25-.5 each time and try getting your ram as low as 2-2-2-5(lowest possible) Biggest performance factor if you want to oc is the CAS latency BTW. If you oc try doing the CAS first.
WARNING: also... if overclocking anything besides memory make sure to set them back to defaults first.