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Actually Pentium-class and newer CPUs have temp sensors:
http://www.intel.com/support/processors/sb/CS-033342.htm
"TCASE is the temperature measurement using a thermocouple embedded in the
center of the heat spreader. This initial measurement is done at the
factory. Post-manufacturing, TCASE is calibrated by the BIOS, through a
reading delivered by a diode between and below the cores."
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