[Beowulf] Shanghai vs Barcelona, Shanghai vs Nehalem

[Bill Broadley]

> AMD could MCM 2 shanghai chips, resulting in 6 cores (2 tri-cores) or 8

AMD socket supports 3 hypertransport channels and 2 64 bit memory busses.
Somehow you would have to connect these to 2 piece of silicon.  I've not heard
that AMD has much MCM experience (unlike ibm and intel).

Intel on the other hand had a very easy time.  Intel's dual die setup was
trivial in comparison, each die was designed to sit on a shared bus and the
memory controller is offchip.

Seems like AMD would have put in a 3rd chip into the MCM, or some how disable
some functionality on one die and share the memory bus/HT from the other chip.