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What is the CPU temp actually reading?


skrybe
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So I started paying more attention to the temps reported by ICUE after having the problems outlined here:

And I noticed another anomaly, the CPU temp doesn't match up with what AMD's control panel has. So I fired up HWInfo and the temps reported there are different as well. There is a roughly 5 degree C difference between what ICUE and AMD report. AMD is close to HWInfo (close enough it might be down to millisecond differences reading the sensor). But I can't find a good match between ICUE and HWInfo at all. The closest match I can see is the motherboard's CPU package temp, but even that is a degree out (44 -v- 45).

So, what sensor is the ICUE CPU actually reading?

Side note: the motherboard temp readings in ICUE aren't a good matchup against HWInfo either 😞

what_cpu_temp1.jpg

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I'd like to know as well. My iCue custom fan curves are based on the coolant temp reading from my 150 Capellix, but I've just ordered a Nexus for monitoring purposes and I'd like to know what "Package" is actually measuring. Where is that number coming from? Seems to be what HWInfo calls "CPU (Tctl/Tdie)", but that's not the average package temp, it's the highest currently reported. I don't see any explanation in the documentation about what this "Package" number in iCue is really.

Anyone know?

 

 

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It's the AMD "TCTL" (Temp - Control) reading. It's not the actual core temperature but a manufactured value to allow you to use a baseline value for fan curves. The idea is that you can set a specific curve that'll work for any CPU based on that same temperature. OEMs might like it, I guess, but I find it silly and confusing.

On my 3970, the difference is around 10-15C, by the way.

Edited by DevBiker
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Thanks for the reply. So the fact none of the temps match is down to what? Slight time differences in reading the sensors? Rounding in apps?

 

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