With their latest core revisions, Intel has introduced modifications to their core that will prevent a large portion of leakage current. Thus, though you may be getting only a minimal reduction in the amount of power used for useful purposes, the gross power draw is significantly reduced. If you recall from the IDF, Intel laid out a roadmap that had 65nm and even 40nm mobile CPUs consuming less than 5W. The smaller you go, the harder it is to prevent leakage – this is something that effects all microprocessors. Although this isn't tackling the issues of continued problems in reducing size, it's a way to make huge improvements in TDP of all processors. 12-Hour-Battery laptops may become quite real in the near future.
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