Posts: 488 from 2003/4/11
I wonder if "on die" means thermal diode inside CPU.
Becouse in this case is I suppose that 'CPU bottom site' <= 'CPU on die'.
But in any case temperatures are low with enough reserve for unsure place of sensor.
Anyway, pmu_max6642-read is super utility.
Well, "on die" actually means that the external temperature measured is the value directly received from the MPC7447A PPC CPU which has an "on die" temperature diode:MPC7447A datasheet
Local temperature bottom side is directly measured by the MAX6642 temperature sensor which I don't really know it's location of on the logic board but it most likely measures more of the ambient temperature. As the "northbridge" and GPU are both located on the opposite side of the logic board, it might be somewhere around there.
Why the "core" temperature is somewhat lower than the actual "ambient" temperature is something I don't really know.