Barcelona has a 2MB cache and Shanghai has a 6MB cache. Just looking at the dies you can see that they are radically different.
If he is talking about Rev. RB-C2, I suppose that he intended to mean Shanghai and Deneb. Barcelona based Opterons were Rev. DR-BA, DR-B2 and DR-B3, while Agena used the last two Revisions for Desktop Phenoms.
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