I ensured Asus website and the "M2N-MX2 does not support the Phenom IIs formally, but do not let that put you off, I have seen bounty people run Phenom IIs old chipsets before yet without authorized bios support. I'd say effort to drop in a Phenom II or Athlon II X4 and if it works great it does not work then purchase the Asrock A770DE. Regardless you'd require a new CPU; the Athlon 64 X2 is actually starting to show its age.