Just wanted to point out that the CPU design used in the xenon (and Cell) was never used in any Apple product at all, nor any other personal computer whatsoever. It's not a derivative of any of the G-series PowerPC chips.So you're comparing a 2 core, single threaded CPU designed from the ground up for low power consumption to a 3 core hyperthreaded CPU designed by IBM, the same core that apple moved away from due to claims of power inefficiency?
So Apple couldn't have moved away from it, since they never used it!