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Temps on new M2 MacBook Pro's

donawalt

donawalt

Contributor
Original poster
Hi all, I just got an M2 Max MacBook Pro. Two different utilities show both the performance and efficiency cores in the 5-7 degrees celsius range. Can they be that low - are they encased in something cool? Or is this a bug reading the sensor?
 
SMC readings report some strange numbers for this new macs, no tool is currently able to correctly read temps.
Looking for a solution...
 
Were these 5-7 °C measurements at idle?
I just placed an order for one with 96GB as well.
Have you measured temps during Final Cut?
 
I don't use Final Cut..for a proprietary software that I use that is intensive, I Just ran it, fans are around 1300 and 1500, efficiency cores went between 75-80C and perf cores went between 70-80C before they settled down to 65-69C about 70% into the activity. Not sure if those numbers are right either. PS - I would say the chassis is at most barely warmer than room temperature.
 
donawalt said:
Hi all, I just got an M2 Max MacBook Pro. Two different utilities show both the performance and efficiency cores in the 5-7 degrees celsius range. Can they be that low - are they encased in something cool? Or is this a bug reading the sensor?
Click to expand...
The sensors for the M1 completely changed for the M2. I'm not surprised that temperature sensor software isn't working yet for the new M2 Pro and Max. Everyone has to reverse engineer the sensors since Apple doesn't document them and apparently feels that changing them with different generations of Apple silicon is fine.

With the M2 there was an amusing discourse with one open source developer who briefly insisted that an M2 sensor called PMU tcal that was always at 51 °C was an actual temperature sensor. Obviously from the name and the fact that it never changes it is a calibration sensor.

I'm sure the updates will be out soon. The names are obscure but the assumption with the M2 was that any sensor with a leading T was probably a temperature sensor but unlike the M1, the names don't appear to have any particular meaning. If you fire up the GPU and look at the temperature changes over time, you can probably figure out which sensors are attached to the GPU. Same with firing up CPU cores though since you don't have individual control over which performance or efficiency core is used it can be tricky getting any more specific than this list of sensors if for P cores and this other list for E cores.
 
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