Im currently running 4gb (2x2gb) ocz reaper pc 6400 @844mhz, 5-5-5-18. Q6600 @3.8ghz, thinking of upgrading to a q9550 soon, which id be trying to oc to 4ghz ono. Would i be better changing my ram to pc8000/8500 or stick with my current kit and see how far i can oc it.