Ok in a very brief nutshell, Clawhammer and Newcastle are the oldest of AMD 64 cores. Then came Winchester, which is a much better overclocker due to lower required VCORE voltage. The newest CPU's are Venice and San Diego, the difference being that San Diego has a 1 MB L2 cache compared to Venice's 512 Kb L2 cache. The Venice and San Diego cores are the best overclockers of the bunch.
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