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I think you misread the article. The power difference stated is between the 11' and 13' processors. Atom processors use around 2.5w, which is 4 times less than the 11' processor in the air.

http://www.intel.com/products/processor/atom/specifications....

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The low power Atom parts aren't remotely comparable in terms of performance performance, so I didn't compare them - the 2GHz Atom Z550 at 2.5 watts TDP has a Passmark score of just 386, compared to 964 for the 1.4GHz Core 2 Duo.

Thanks, I wasn't aware there was such a large performance difference.

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