I upgraded my Dual 450 Mystic with 1.2GHz Sonnet and was a little disappointed with the gain in performance. I ended up going to a dual 1.2GHz GigaDesigns. Both these companies are very professional and have good backup. Different manufactures have different system requirements so read the specs carefully, you may need to upgrade your firmware and some AGPs don't support Duals. I looked for the CPU that just plugs in and goes. If you can stretch your budget, go with a dual. Rob On 13/12/2004, at 11:10 AM, Richard M. Kriss wrote: > Maybe I should consider one of the new after market faster processors. > I > wonder if I will really see much difference with something less than > a 1 > GB?