you will never see the true performance of that cpu because the ht link speed is less than half what it would be on an am3+ board. also the ram is slllloooooow... upgrading to a new cheap am3+ board and ram with 1066 or even 1333 will show a huge boost in performance. well at least 50% over just banging it into your current board.
oh i almost forgot not all am2 boards will support am3 cpu's as the manufacturers of the boards tend not to upgrade there bios's when new arcitecture comes out even if its on a similar socket that would generally work. i had this issue with both asus and gigabyte when i had my old amd 6000x2 and wanted to upgrade to phenom. so make sure it is fully supported b4 you buy or you will have to upgrade the mobo, which i suggest you do as soon as you can.
The motherboard I have now says it supports Phenom II X4 right on the cover of the box, This motherboard isn't to old either, less than 6 months. I bought it because I could put my RAM and CPU in it without upgrading them because I didn't have the money too. at the moment I don't have a job, because of school, so when ever I get money, I get what I can before the money is gone.... Even though its a bad habit. The moment I get a job, I plan on saving $2,000+ and buying the best parts I can.