What you will need to do is to BIOS flash your motherboard, in other words, updating the BIOS.
Download the latest BIOS from here: http://www.asus.com/product.aspx?P_I...vev&templete=2
And update from a flash drive using ASUS EZ Flash utility inside the BIOS.
Looking at the CPU support list, it seems your motherboard supports every one of the 65nm Phenoms, just not the 45nms (Phenom II line). IMO, the best value Phenom right now is the 9600 for $90.