I have two sticks of the Corsair XMX2 800 MHz. gaming RAM. (2 gigs) I recommend that ram. Its good ram. I have the E6400 and I am overclocked to 3 GHz. right now and the RAM is holding fine. I recommend at least an 800 MHz. RAM because the mobo supports 800 MHz. RAM. Also make sure you run the RAM in a dual channel configuration when you install it.