I currently have an AMD athlon 2200 running at 1.8. Is it worth me upgrading to an AMD Sempron 2800, which looking at articles the Sempron suns at 2Ghz not much more than my current processor, however the fsb is 333. Will I notice much diference if I upgrade? What is the difference between the Athlons and the Semprons? I use the PC for some gaming (Have half life 2), but mainly downlaoding etc.