Hmm I am going to say something different and ask you to check your motherboroard specs and see what its capable of handling. If say you can go up into the amd 800+ range for $59 bucks or so you could enhance the performance quite a bit. The 64 ram bothers me though and in any system i ever saw a combo of 256 and 64 it was nothing but trouble and as far as i could tell didnt help improve anything and accually slowed things down . But each system is so diiferent it would be hard to tell unless you bench marked it with it in and out.