havoc,
But that 3-4C socket-thermstior temp difference can be a 3-12C core temp difference....
For example, in mikhailtech.com's review of the thermoengine, on their synthetic test bed there was a 5C difference between Thermoengine stock-fan and thermoengine delta 60x10mm. On a Duron test platform, that 6C difference measured as 1C difference.
So in this case, the socket-thermsitor exhibited a 6X temp compression between the two heatsink/fan combo's.
Mike