AMD's Bobcat and Bulldozer

[-Boris-]

They mentioned IMC and NB as separate units since K10.

So what is this NB? What does it do? It isn't the bus interface (HT) since that would make every processor with a bus regarded as a processor with an on-die NB. And it isn't the IMC, what is it then? Source please.

EDIT:
At this point, I do believe BD fits ordinary AM3. And I don't think the PCIe is integrated. But I do have some big questions to sort out first.