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Originally Posted by Cathar
gf, I believe that they meant that the diodes are specifically calibrated for shutdown at 135C during the manufacturing stage. All diodes require calibration, and they just can't leave it to chance that some random diode on some CPU they make won't correctly shut the CPU down when it hits the critical 135C. I believe that this is what is meant by that statement. Otherwise the statement makes no sense. Why would anyone calibrate a diode to read differently to other CPU's? The act of calibration essentially means to bring the diode within acceptable error margins, which would make the ALU temp probe specifically ideal and consistent from CPU to CPU.
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Each cpu has its own critical heat point. Some can function fine at higher heat while some have a lower threshold.
The ALU diode reading does not shut down the cpu (and readings are spaced in milliseconds). If you read the article you will see that it only triggers the send delay, to cool the alu (which are running at twice the cpu clock btw). The other on die diode is the shut down one, the one that the motherboard can read.
Besides the ALU is rapid functioning and you would only be able to get an average reading because the measurements are taken in milliseconds. So when instructions are being done there will be high heat. If send delay is triggered you will get artificially low averages so theorietically a poor heatsink could give the same reading as a good one.
In conclusion it is a folly to think that if only Intel would let us read the alu diode all would be fine. It is there for a specific function and would not give an accurate die temp for determining heatsink performance.