SegaXtreme

I currently have an AMD Athalon XP 1800. I was looking at upgrading it. Looking at what my system board supports (Gigabyte nForce 2) I am curious about the differences. Whats the difference between an Athalon XP Barton, Athtlon XP Thoroughbred, and a K7 Sempron? Which is best for gaming?
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