Theoretically: Phenom IIx4 965BE 125W C3 step.
According to their support list on the website: Phenom x4 9950
But seriously, do some research first. The answers to your question are located on the motherboard's product page on their site:http://www.asus.com/product.aspx?P_ID=NFlvt10av3F7ayQ9
Under CPU support list. They even tell you what bios revision you need.