PowerPC, Cell and POWER processors are now jointly marketed as the Power Architecture.
Power.org released a unified ISA, combining POWER and PowerPC ISAs into the new Power ISA
v.2.03 specification and a new reference platform for servers called PAPR
(Power Architecture Platform Reference).

今は、同じモノですw
IBM的にはすべてPOWERアーキテクチャ
(だが本物のPOWERは滅んでPowerPCがPowerアーキということになった)