+12 Voltage Constantly at +10.48 V on ASUS M5A78LE

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Dear @ll,

I am monitoring multiple systems (with Asus M5A78LE mainboards) using sensors and Munin.

On one of the nodes, the +12 V value is constantly reported to be +10.48 Volt which
causes Munin to report a warning (value outside 10.92 to 13.08 Volt range).
The value seems to be close to +12 V on all other nodes.

One idea was that the system reduces voltage to save power.
Therefore I caused some load on the node:

root:/home/root # md5sum /dev/urandom &
root:/home/root # md5sum /dev/urandom &
root:/home/root # md5sum /dev/urandom &
root:/home/root # md5sum /dev/urandom &

What I can see is that the 1.4 V value is now constanly at 1.38 V.
Previously, it jumped between 1.01 V and 1.38 V.
However, there is no difference in the +12 V value.

I do not understand why the 12 V value stays at such an low voltage.

May any power saving options cause that behaviour (when yes, which settings can cause that)?
Do you have any ideas how I can localise the cause of the +10.48 Volt value?

Thanks for your help.

Best regards
Sascha Haupt



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