Do you mean the Athlon FX? That's closely related to the Opteron and uses socket 940. Athlon 64s use socket 754. Athlons, Durons, and Athlon XPs (thoroughbred, thoroughbred B, Barton, among many others) use socket 462, also called socket A. Your motherboard has socket A, and the manual will have a list of officially supported processors (sometimes expanded with bios revisions as faster processors coome out).