Well then, as mentioned above, you're better off just starting from scratch then. Go with an AM2 board if you really want to stick with AMD. Or better yet for gaming (IMO of course), go with something like an Intel P35, P43, or P45 board and an E7400 wolfdale or similar.
I have a gigabyte P43, E7400, 8800GT 256 and it scores over 11,000 3DMark06. Not breaking any records, but not too shabby for a budget gamer.
I had an AM2 crosshair with a 5200+ and an 8800GT 512 that barely scored 7,000. I replaced the mobo with a gigabyte p35, and cpu with an E6750, and left everything else the same and it scored nearly 4,000 higher, which is a big impact on games, and proved to me that it doesn't always pay to save a few dollars.