Well the Q9400 that I have been using seems to oc as good as or a little better than the Q6600 cpu's. Tomorrow I will finally have my hands on a Q9650 that I have been saving for. I am hoping it will be my first cpu to hit 4GHZ. I will be running it on this rampage mobo. I will let you know how it goes. So far I am very pleased with this mobo.