iStat just reads the temperature values from the SMC using IOKit calls. I think the problem may actually be a little deeper. At that point I decided to leave things alone and let the firmware deal with fan control on its own. I ran a test a few weeks ago with higher fan speeds, and while I expected the temperature to go down, instead it went up. That would account for the reading working backwards I suppose.Īre there any other programs that report CPU temps that I could use to check?
It almost seems to be what is happening is that iStat is reading the "distance to TjMax" and reporting that without doing the math. I know with Intel that the CPU just reports the distance to Tjmax and then the software reading that number takes the TjMax reading for that particular CPU model and figures out the corresponding Tj. All the fan speeds stay the same so it is not extra cooling kicking in. But then if I fire up all the cores (Handbrake for example) then the reported CPU temps DROP to about 48C and 43C (notice same differential of 5C between CPUs). At idle I am reading about 60C on one CPU and 55C on the other.
#Istat test answers pro
However, when I added it to my Mac Pro I am getting goofy CPU temp readings. One of my favorite apps on my Macs is iStat Menus for which I purchased a family pack. I have a 2006 Mac Pro 1,1 with dual Xeon 2.66GHz.
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