Shintai , sorry but I have to add a few things :P
What you're describing is the desktop Atom.
For embedded and mobile they use the System Controller Hub ( which integrated the NB and SB ) with a TDP of 1.6 to 2.3w .
Page 423 http://download.intel.com/design/chi...hts/319537.pdf
and page 2 here http://download.intel.com/design/chi...brf/319545.pdf
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