Arch Linux

d_fajardo

Member

Registered: 2017-07-28

Posts: 1,687

Different CPU temp between sensors and i7z

This is purely a question out of curiosity. My system is running fine and stable. It's just a get different readings of CPU temp from different applications.
sensors report:

Package id 0:  +48.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:        +46.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:        +48.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:        +45.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:        +45.0°C  (high = +80.0°C, crit = +100.0°C)

but i7z reports:

 Core [core-id]  :Actual Freq (Mult.)      C0%   Halt(C1)%  C3 %   C6 %   C7 %  Temp      VCore
 Core 1 [0]:       3943.73 (39.44x)      6.19    90.5    1.73       1       1    32      1.2949
 Core 2 [1]:       4323.64 (43.24x)      2.78     5.4       1    19.8    70.9    32      1.3099
 Core 3 [2]:       4488.57 (44.89x)      3.63    8.39    1.36    53.5    32.9    32      1.3049
 Core 4 [3]:       4075.57 (40.76x)      2.41    9.51       1    19.1      68    31      1.3099

Of course I'd like to believe i7z is the correct one!
Does anybody know why the difference? It's a massive difference of more than 10 degrees.

paulkerry

Member

From: Sheffield, UK

Registered: 2014-10-02

Posts: 611

Re: Different CPU temp between sensors and i7z

Maybe it's something to do with your particular hardware? What hardware and CPU are you using?
Presumably you are using the "coretemp-isa-0000" sensor for your sensors command?

For comparison, on the laptop I use with a i7-4702MQ CPU, sensors and i7z are within 1 degC of each other when looking at the "Core 0-3" lines in sensors. The "Package id 0:" is always 5-6 degC hotter.

Don't forget you can tweak sensors values manually (I've had to do this on a couple of Xeon systems in the past) - see https://wiki.archlinux.org/index.php/Lm … and_tricks

d_fajardo

Member

Registered: 2017-07-28

Posts: 1,687

Re: Different CPU temp between sensors and i7z

I've got an Asrock Taichi Z270 motherboard and Kaby Lake i7 7770K and the command I use is write.
Thanks for leading me to the tweak. I wasn't aware of that.