Plenty of reviews have shown the 45nm C2Ds and C2Qs to have exceptional power usage. Like here where the QX9650 uses less power than a E6750:
http://www.techreport.com/articles.x/14606/12
Or Anandtech's examination of the QX9650 which suggests it probably doesn't hit its TDP till around 3.8GHz
http://www.anandtech.com/cpuchipsets...spx?i=3184&p=2
It's pretty evident that the Intel's mainstream dual-cores use 20-30W under full load while even the QX9650 only consumes about 65W.
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