Original AMD [Athlon] 64 core. This was found on both the Socket 754 and Socket 939 interfaces. The [Clawhammer] core featured 1 MB of [L2] cache and ran a 800MHz Hypertransport bus. Furthermore, the Clawhammer was based on the 130nm manufacturing process. These processors ran roughly 20 - 30% faster than the Athlon XP [Bartons] at the same clock frequency.
Do not confuse the Clawhammer with the newer Newcastle core which is also on the Socket 754/939 but features only 512KB of L2 cache. The Clawhammer core was the original Athlon 64 and is the core for the Athlon FX series (53, 55).

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