I know it probably doesn't effect gaming, but it did make my pc a fair bit quicker...is to enable the L2 Cache, because by default, Windows don't have it enabled....there are a couple of other memory tweaks on the following page too which improved my pc's performance, including games, i know the topic says Vista but a lot work all the same....
Credits to X1337..
http://www.computerforums.org/showthread.php?t=39184
Matt