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Unknown AUX sensor in SpeedFan

Last response: in Applications
December 19, 2006 2:02:45 PM


I've started using SpeedFan to monitor my temps, and I have four channels: System, CPU, AUX and HD0. The system matches the northbridge measurement from PCProbe, and the CPU temp matches the CPU temp from PCProbe, and these channels give believable numbers. I'm not heavily using the HDD, so HD0 temp stays around 27C without too much variation.

My question is what might the AUX channel be? There was no similar channel in PCProbe. The AUX channel reports temps that are generally 18C or so cooler than the CPU. I relate AUX to CPU because the AUX temperature rises with CPU activity. However, the characteristic is very different. For example, if I load my CPU to full, the CPU temp eventually reaches 55 to 56C, with the AUX at a little over 30C. When I bring the CPU down to 0% activity, the CPU temperature slowly comes down to about 32C (first-order response). The AUX channel, however, reports lower temps immediately (step-function). From this I would expect that the CPU temp is associated with the case or core temp of the CPU, and the AUX is either close to the CPU, or is a temp measurement on the Mobo.

Does anyone have an idea as to what the AUX channel is reporting?
January 22, 2007 5:11:21 PM

I have a similar issue, except its an opposite...

Current temps idle:

System 35C
HD0 31C
HD1 23C
HD2 27C

When I run SuperPi 1M

System at load temps:

System 35C
HD0 31C
HD1 23C
HD2 27C

I can't understand why the temperature reduces under load, I've searched for an answer but have yet to find one.

System Specs:

P 945D at 3.4Ghz (stock)
Asus P5WD2E Premium (Bios 0604)
2x 1GB OCZ Spec Ops Edition DDR2 PC6400 @ 800mhz
Asus x1900xt Crossfire Master
Reserator 2 cooling CPU & NorthBridge
X-Fi Fatal1ty
BFG 128MB PhysX
Zalman 600W heatpipe PSU

I've tried removing and reinstalling Speedfan but it made no difference. Any help would be gratefully received.
January 15, 2008 11:35:44 AM

Very late (over a year, lol)

I think you'll find the Aux is refering to your monitor. At least it does on mine anyway.
Related resources
a b à CPUs
August 22, 2009 7:06:58 AM


system 83
cpu 51
aux 119
hdo 39
core 1 37
core 2 37
i dont get it why so hot
January 9, 2011 10:47:39 AM

I figured what the hell last post was over a yr old. I just wanted to say I have the same type of reading going on.

system 33c
gpu 45c
cpu 40
aux 65c system start up was 85c, it dropped after a few min of being on.
hdo 24c
hd1 27c
core 1 25c though I have a 6 core cpu