Many modern mainboards have temperature probes in the processor socket, if the mainboard supports hardware monitoring, which is a feature you should able to find in your BIOS. The software accesses this information.
If you'd prefer another method of keeping tabs on the temperatures, and perhaps even controlling the fan speeds, you might find something of interest on this <A HREF="http://www.directron.com/sensors.html" target="_new">page</A>.
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