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faster CPU requires more energy.
if you are going to use ppc as mp3 player, you can underclock the cpu, and battery will last longer (i underclocked my hx2750 to 300mhz, played only music, and it lasted for about 20 hours, at 624mhz it take only about 4 hours to discharge the batt.)
about emulation, you can try it, i dont think it will make much difference (except faster battery discharge)
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