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Old 11-10-2007, 01:11 AM   #1
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CPU temperature sensors

Hi!I don't realize which is the real temperature of my cpu as sensors shows 3 different misures.. could it be temp2?
Thank you!

debian:/home/ema# sensors
Adapter: ISA adapter
VCore 1: +1.57 V (min = +1.20 V, max = +1.60 V)
VCore 2: +3.25 V (min = +1.20 V, max = +1.60 V) ALARM
+3.3V: +3.26 V (min = +2.82 V, max = +3.79 V)
+5V: +4.92 V (min = +3.44 V, max = +2.61 V) ALARM
+12V: +11.92 V (min = +0.24 V, max = +1.95 V) ALARM
-12V: +1.95 V (min = -14.25 V, max = -14.17 V) ALARM
-5V: +3.14 V (min = -7.71 V, max = +0.33 V) ALARM
V5SB: +5.59 V (min = +0.11 V, max = +1.83 V) ALARM
VBat: +2.06 V (min = +2.18 V, max = +0.54 V) ALARM
fan1: 0 RPM (min = -1 RPM, div = 128) ALARM
fan2: 2836 RPM (min = 4687 RPM, div = 4) ALARM
fan3: 0 RPM (min = 21093 RPM, div = 2) ALARM
temp1: +23C (high = +0C, hyst = +42C) sensor = thermistor
temp2: +35.5C (high = +80C, hyst = +75C) sensor = thermistor
temp3: +12.5C (high = +80C, hyst = +75C) sensor = thermistor
vid: +1.525 V (VRM Version 9.0)
alarms: Chassis intrusion detection ALARM
Sound alarm enabled
Old 11-10-2007, 08:17 AM   #2
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If that's the only one connected, then: yes, it is. But given the various alarms you're getting I wonder how accurate it is...
Old 11-11-2007, 05:11 AM   #3
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In general, none of them are truly "accurate".

The on-chip ones are semiconductor sensors and measure via the well known change in diode characteristic with temperature. The trouble with this is an odd millivolt or so of offset in the measuring throws the accuracy out. So it measures more or less the right thing but without great accuracy. You may well be of the opinion that that is not the greatest idea.

The thermistor ones are inherently accurate to +/- a degree or so, which you may or may not think is good enough. The trouble is that these are mounted somewhere other than on the chip and are therefore measuring the wrong thing (the temperature at some distance from the silicon) with reasonable accuracy.

Any of these is probably good enough to initiate a shutdown when something goes badly wrong, but if you have some other requirement, they may not be good enough, depending. Me? On initial prove-out I use an optical pyrometer, which isn't absolutely accurate either, but at least I know what it is claiming to measure and I have one hanging around! And if I know, +/- a degree or so, what the 'real' temperature is, I can use that to correct the limits that I set on the measured sensor temperatures (if that make a big enough difference to worry about).

So you pays your money and takes your choice.
Old 11-12-2007, 10:51 AM   #4
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in regards to those alarms.. the min/max values set for most of those items are way out of range for what they are supposed to be monitoring..

for example the +5 Volt power line.

+5V: +4.92 V (min = +3.44 V, max = +2.61 V) ALARM

+5 Volts
4.92 V ACTUAL READING this looks correct. or at least close enough it shouldn't cause a problem
but the MIN/MAX values don't go up to 5 Volts and the max value is less than the min value.. ??

Pick a line that's showing alarm, and almost all of their configurations are out of whack like that..


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