> recent BlueGene system is built around 8192 "Power BQC" processors > at 1.6 GHz each, which I assume have PPC A2 cores (like PowerEN).
Confirmation:
"IBM's hardware people cleared up the mystery about the processor at the heart of the BlueGene/Q super, saying that it is [...] a 16-core Power A2 processor" http://www.theregister.co.uk/2011/02/08/argonne_ibm_bluegene_q_super/
More info: http://power.org/wp-content/uploads/2011/03/IBM_March_29_Webinar_-_Dr._Luigi.pdf (pages 7 and 26)