@chew* Sandy got wider (and had an iGPU of all things to integrate), while BD partly tries to streamline work for clockspeeds. (by extrapolation, it's quite easy to see how good SB-E can clock without the extra baggage)
Only time will tell whether there are some stupid mistakes in the process of getting there, like Netburst.
Do remember though, that AMD Austin is the lead design for BD (as far as I know), a stronger team than the one that leaded K10 in general. These guys did Athlon Classic, A64 and more.
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