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These are not the same Power PC CPUs that are in Macs. They are stripped down, simplified cores. It may well use less power and produce less heat than the original xbox.
Look at the IPC. Two instructions per clock cycle, max. An athlon is 9, a P4 is 6, a full fleged G5 is 7 or 8. The Xbox 2 processors will also lack most of the instruction sets that are found in desktop CPUs.
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