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Old 09-11-2010, 05:15 AM
 
Default How to correctly read CPU temperature ?

Hi,

with the command "sensors" (lm_sensor) I can read out the
temperatures/voltages of my mobo/cpu:

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage: +1.35 V (min = +0.80 V, max = +1.60 V)
CPU/NB Voltage: +1.16 V (min = +0.80 V, max = +1.60 V)
CPU VDDA Voltage: +2.50 V (min = +2.00 V, max = +3.00 V)
DRAM Voltage: +1.51 V (min = +1.40 V, max = +1.90 V)
HT Voltage: +1.20 V (min = +0.80 V, max = +1.50 V)
NB Voltage: +1.10 V (min = +0.90 V, max = +1.35 V)
SB Voltage: +1.11 V (min = +0.80 V, max = +1.50 V)
+3.3V Voltage: +3.34 V (min = +2.97 V, max = +3.63 V)
+5V Voltage: +4.97 V (min = +4.50 V, max = +5.50 V)
+12V Voltage: +12.21 V (min = +10.20 V, max = +13.80 V)
CPU Temperature: +35.0 C (high = +40.0 C, crit = +90.0 C)
MB Temperature: +31.0 C (high = +35.0 C, crit = +95.0 C)
NB Temperature: +46.0 C (high = +65.0 C, crit = +95.0 C)
SB Temperature: +40.0 C (high = +35.0 C, crit = +75.0 C)
OPT_TEMP1 Temperature: +0.0 C (high = +0.0 C, crit = +90.0 C)
OPT_TEMP2 Temperature: +0.0 C (high = +0.0 C, crit = +90.0 C)
OPT_TEMP3 Temperature: +0.0 C (high = +0.0 C, crit = +90.0 C)

But there is something I worry about: The CPU temperature.

On the Inet I found some, but not very clear infos, which say, that
the temperature sensing diodes of the AMD Phenom II x6 T1090 were
wrong. Second thing is, when idleing the CPU of my box has only 34
degree C -- which would be nice if true, but I dont believe that:
The CPU is cooled with a Scythe Mulgen 2 Rev.B or with other words
its only a fan and therefore only air cooling...

When booted into the BIOS the "hardware info" shows a higher
temperature for the CPU while idleing than the above shown command
output. But: From where the BIOS takes its informations?
Are there any "formula" to convert the raw value into the real world
value? And from where I can take that formula?

Thank you very much in advance for any help!
Best regards
mcc

PS: Mobo is a "ASUS Crosshair IV Formula". I am neither a hard
overclocker nor a gamer (no punt intended!
 
Old 09-13-2010, 07:08 PM
Paul Hartman
 
Default How to correctly read CPU temperature ?

On Sat, Sep 11, 2010 at 12:15 AM, <meino.cramer@gmx.de> wrote:
> On the Inet I found some, but not very clear infos, which say, that
> *the temperature sensing diodes of the AMD Phenom II x6 T1090 were
> *wrong. Second thing is, when idleing the CPU of my box has only 34
> *degree C -- which would be nice if true, but I dont believe that:
> *The CPU is cooled with a Scythe Mulgen 2 Rev.B or with other words
> *its only a fan and therefore only air cooling...

I think you need either k8temp or k10temp module in your kernel. Check
documentation in your kernel sources to see which chipsets are
supported by each (or enable both and see which on works).
 
Old 09-13-2010, 07:33 PM
 
Default How to correctly read CPU temperature ?

Paul Hartman <paul.hartman+gentoo@gmail.com> [10-09-13 21:27]:
> On Sat, Sep 11, 2010 at 12:15 AM, <meino.cramer@gmx.de> wrote:
> > On the Inet I found some, but not very clear infos, which say, that
> > *the temperature sensing diodes of the AMD Phenom II x6 T1090 were
> > *wrong. Second thing is, when idleing the CPU of my box has only 34
> > *degree C -- which would be nice if true, but I dont believe that:
> > *The CPU is cooled with a Scythe Mulgen 2 Rev.B or with other words
> > *its only a fan and therefore only air cooling...
>
> I think you need either k8temp or k10temp module in your kernel. Check
> documentation in your kernel sources to see which chipsets are
> supported by each (or enable both and see which on works).
>

As stated by AMD itsself. the temperature read by that module are
relative and not absolute.
Thats why I use the output of tk0110-acpi-0.

Live-example, taken at the same time:

k10temp-pci-00c3
Adapter: PCI adapter
temp1: +19.0 C (high = +70.0 C, crit = +90.0 C)

atk0110-acpi-0
CPU Temperature: +34.0 C (high = +40.0 C, crit = +90.0 C)

This is a difference of 15 degree Centigrade inside the CPU.
I would like to have THAT fan, which accomplish THIS delta...
sigh...
Also the "high" values are definitely VERY different...

Science is the explanation, why somethingd does not work...

Best regards
mcc
 
Old 09-13-2010, 08:56 PM
Bill Longman
 
Default How to correctly read CPU temperature ?

On 09/13/2010 12:33 PM, meino.cramer@gmx.de wrote:
> Paul Hartman <paul.hartman+gentoo@gmail.com> [10-09-13 21:27]:
>> On Sat, Sep 11, 2010 at 12:15 AM, <meino.cramer@gmx.de> wrote:
>>> On the Inet I found some, but not very clear infos, which say, that
>>> the temperature sensing diodes of the AMD Phenom II x6 T1090 were
>>> wrong. Second thing is, when idleing the CPU of my box has only 34
>>> degree C -- which would be nice if true, but I dont believe that:
>>> The CPU is cooled with a Scythe Mulgen 2 Rev.B or with other words
>>> its only a fan and therefore only air cooling...
>> I think you need either k8temp or k10temp module in your kernel. Check
>> documentation in your kernel sources to see which chipsets are
>> supported by each (or enable both and see which on works).
>>
> As stated by AMD itsself. the temperature read by that module are
> relative and not absolute.
> Thats why I use the output of tk0110-acpi-0.
>
> Live-example, taken at the same time:
>
> k10temp-pci-00c3
> Adapter: PCI adapter
> temp1: +19.0 C (high = +70.0 C, crit = +90.0 C)
>
> atk0110-acpi-0
> CPU Temperature: +34.0 C (high = +40.0 C, crit = +90.0 C)
>
> This is a difference of 15 degree Centigrade inside the CPU.
> I would like to have THAT fan, which accomplish THIS delta...
> sigh...
> Also the "high" values are definitely VERY different...
>
> Science is the explanation, why somethingd does not work...
>
> Best regards
> mcc
>
>
>
And if you have an Asus mobo, you can use their kernel module (in the
later kernels).
 

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