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Originally Posted by GlassMan
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Nice link.
Now the picture is crystal clear.
There are only 2 sensors in a P4. (no mysterious 3rd one)
PROCHOT and THERMTRIP are registers which are either active or non active. They are set to active when a set temp is reached.
These two set temps are unique to each processor.
The trigger temp for PROCHOT and THERMTRIP is taken from the same temperature sensor.
THERMTRIP is always set higher than PROCHOT
THERMTRIP and PROCHOT temp triggers are set at factory and cannot ever be changed.
The only other temperature sensor is the on die thermal diode and has nothing to do with PROCHOT or THERMTRIP.
Using logic.....
Intel must take readings from the thermal sensor to determine each individual processors PROCHOT and THERMTRIP set point. Once they are determined and set, the functionality of the thermal sensor is only to indicate these 2 trip points to set the PROCHOT and THERMTRIP registers active. We know it is located near the ALU units so it may be logical to assume these trip points are ALU unit specific instead of P4 processor as a whole specific. After all if the ALU units fail, the processor is junk.
After all of that, I do not see the value of getting readings from this thermal sensor. It is uniquely callibrated per processor and near the hottest and most fluctuating heat source the ALU units. There are factors to consider that makes no 2 ALU's have the same heat output like voltage leakage.