The Thorton is an AMD Athlon XP part it does not replace the AMD Duron. There are three speed grades 2000+, 2200+ and 2400+ which only replace the Thoroughbred core parts of the same model number.
The reason for the product is that its still a volume part as customers are selling many systems with VIA KM266 chipsets and that it does not make sense to still make Thoroughbred part at that lower FSB of 266 MHz, so we just modified the Barton core, to the specification of the value end of the Thoroughbred core products. So the parts have 256k cache and 266 MHz FSB.
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