[pHaestus]

Allbigger:
Are you asking if CPU diodes are PRECALIBRATED from the factory? Well they have a tolerance and different CPUs generally are within ~1C of another. But the solder joint introduces resistance in the diode reader lines and this varies every time you solder a new CPU up. The calibration vs. a known thermometer in a water bath is designed to deal with all the possible variables in the diode reader/wires/CPU diode system so that it's in cal.

The dT CPU-water is the same for the same wb at the same flow rate and at the same vcore/FSB/multi on multiple chips. Since I did the calibration of the whole soldered up system described before.

And YES if CPU temps go down then C/W would decrease. How much though? Is this a constant change (an offset) for all wbs, or do some cool the IHS or die area in a way that makes them particularly affected by the change? THIS is a good question I think.

flatline:
I have an MP-05 Xtreme downstairs and a WW. I have a question though. If I am choosing only 3 or 4 wbs for the IHS vs. bare die test, then what would be the justification for the ones you have named?