The cache control software indicated the processor was running at 82� F in OS 9.2 and 95�F in OS 10.3 The temperatures seem acceptable. I realize that a processor is probably working harder and hotter in OSX. However, I also wonder about the accuracy of software based thermometers.
The CPU temperature register reading software is generally accurate in a relative sense but not in an absolute sense. In other words, if you take two temperature measurements the difference between them is probably accurate, but the measured temperatures probably are not. So, in the example above, your computer may actually be 78 & 91 or 88 & 101.
However, to further complicate matters, I'm guessing that the temperature reading utility in OSX is different from the utility in OS9 and if that's the case, the two utilities may interpret the CPU temperature in different ways.
In all cases the utility is reading the value stored in a register in the CPU chip and trying to turn that value into an accurate temperature. Motorola has a tech note about this which points out that hte only way to get an accurate reading is calibrate the CPU with some kind of thermometer.
I'd write a bit more but the little guy (2 YO) needs a nap.
Jeff Walther
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