Hmm Yea i guess the mobo will be fine. I just thought of an idea. Why not see if your mobo supports athlon 64 x2? You can get a decent one for i think $180 NZ so not sure how much US but that would be a good option

EDIT: are you sure your mobo is called a Asus A7V9X-X because when i googled it this thread was the first result