Hi,
For reference, this is ESXTOP taken from a server with 2 x 6276 (16-core) CPUs.
It indicates 4 distinct CPUs with 64GB Ram each (256GB in Server)
I also queried this via AMD and got a response as follows:
http://devgurus.amd.com/message/1284837
I can't speak for the 12 Core though but it appears to be 2 x 6 Core per CPU die.
Mike