The current XO model already uses an average of only 5 watts but the company claims power draw is still their biggest problem. A typical ARM processor, on the other hand, uses significantly less than a watt. Microsoft has traditionally declined to make a full-blown Windows OS for ARM, but then again, as Nicholas Negroponte states, the XO-2 is still 18 months away from release and a lot can change in that time frame.
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