AMD 'Pluto'
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This AMD Athlon 650 Slot A processor has OPN code K7MTR51B with an A-marking. The A means it's equipped with the Pluto core. If you have a model with C it has the Argon core. Pluto is 180nm and used in the 550MHz to 850MHz models with 512KB off-die L2 cache. Argon did it's job in 500MHz to 700MHz Athlon's with again, 512KB off-die L2 cache. > Read more