hi guys, need ya advice, i'm currently running C2D 2.33GHz, Asus p5k se motherboard, corsair 667Mhz ram, Nvidia 8600GT.

-I'm currently thinking to upgrade my RAM all to 4GB, just to confirm is there any big diff in performance from 800Mhz ram to 1066Mhz

-I've google and they say there no much diff, any1 have experience with this

-Your advice will be greatly appreciated