This CPU is actually clocked at 2600MHz just the same as the FX55 but in the case of Athlon 64 4200+ the multiplier is locked higher. The 4200+ has 1MB of cache built on 90 nanometre marchitecture and works with 1.4 volts.
The Inquirer describes the CPU as being "a San Diego core... [that] has SSE3 and it is built on 90 nanometre marchitecture."
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