As true as it was several years ago it stands today, the cheapest way to increase a system’s speed is to increase the amount of ram up to a certain amount. The magic amount used to be 4GB and it seems to be increasing to around 8-16GB especially with Microsoft pushing 64bit. Fortunately Crucial has put out a 8GB sport kit with surprising results.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips