three (IBM) PPC G5 in it.
Isn't this just a case of a journalist making false conclusions from "three IBM chips"?
It just doesn't make sense. The G5s cost a couple of hundred $ each, don't they? 3 CPUs? Why not 2, 4, or some other even number? Why would the XBox 2 need such a ginormous CPU power? The predecessor did its stuff with a lowly Celeron for a CPU, and a kickass graphics system.