After I left that message I went to the Asus website and checked the CPU compatibility chart for that board. It lists an Athlon 64 x2 +5600 65W as being compatible, but my CPU is an Athlon 64 x2 +5600 95 W version. It looks like I might be out of luck with this board. I have to do some more checking around and see what I can turn up.
I downloaded the manual and it's not the wattage that's the problem. It's that the board takes 45 nm CPUs. Mine is 90 nm.