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These 2 have diffrent cores - one is a newcastle - the other is a winchester. And as you can see they are manufactured using 2 diffrent processes - 90nm and 130.
Its basically the same as the diffrence between northwood and prescott with the P4 (i am sure you've heard about them).
However - which core is better i cannot answer because i am not an AMD guy. I am sure they both perform their intended tasks the same way but there might be diffrences when it comes to overclocking etc.
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