It may slow it down a wee bit, but that chip is also an easy overclocker. Even if you only bump the clock rate up slightly, increase the northbridge to 2600 ish and see MASSIVE gains in cpu thruput. By using this method you can keep voltage and heat under control while getting very significant gains.
You will notice, believe me. And that will give you time to decide whether and upgrade is in order or not. Hunt down the AMD overclocking forum and you will get good advice on how to do this safely and easily.