difference between 7455A and 7455B processors

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does anyone know the difference between the Motorola 7455A and 7455B G4's?

any insight is appreciated!

thanks,
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[Coolvirus007]

the g4 quicksilver and MDD are 7455. I don't know about the b though. I think that there are 7455b processors available for upgrades.

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anyone ?