pc probe - Chassis Fan erratic readings

[wheel]

I have a p4p800 deluxe, and run the pc probe software for monitoring
fans and temps. The chassis fan monitor reads fine for a couple minutes
(around 2400 rpm) and then freaks out - it charts off the scale and
reports a value like -28000, then 9800, then back to around 2400. The
fan itself doesn't seem to change at all. What is this all about?

 

[Tim Draper]

possible to swap with another fan? thus determining weather it's mobo or fan
rpm sensor problem?

tim

 

[Paul]

I have a p4p800 deluxe, and run the pc probe software for monitoring
fans and temps. The chassis fan monitor reads fine for a couple minutes
(around 2400 rpm) and then freaks out - it charts off the scale and
reports a value like -28000, then 9800, then back to around 2400. The
fan itself doesn't seem to change at all. What is this all about?

A possible problem, is using two monitoring programs at the same time.
Asus Probe is believe not to use a semaphore to access the SMBUS. If
two programs try to use the SMBUS at the same time, to talk to the
monitor chip, the values read back can get garbled. Are all the
voltages and fan speeds confused ? If only one value is nonsense,
then that probably isn't the problem.

The other problem could be the tachometer output of the fan could
be marginal, and the monitor chip is not getting a clean signal. This
could be a defect in the fan, or in that input line on the monitor chip.

HTH,
Paul

 

[wheel]

possible to swap with another fan? thus determining weather it's mobo or fan
rpm sensor problem?

tim

I'll try that, thanks.

 

[wheel]

Thanks. There is only one monitoring program running that I know of...
I'll try to swap in another fan and see if that solves the issue.

 

[billh]

I have a p4p800 deluxe, and run the pc probe software for monitoring
fans and temps. The chassis fan monitor reads fine for a couple minutes
(around 2400 rpm) and then freaks out - it charts off the scale and
reports a value like -28000, then 9800, then back to around 2400. The
fan itself doesn't seem to change at all. What is this all about?

If you aren't sucessful remove Probe and install Motherboard Monitor. I
don't know about the current version but older versions of Probe were
notorious for false readings. I have a p4P800 and it gave a bad reading
(temp or rpm?) with Probe after about only 2 days running. I now use
Motherboard Monitor like on my other ASUS machine.

Billh

 

[Tatu]

I have a p4p800 deluxe, and run the pc probe software for monitoring_______________________________________________________________________

Hia all!

That chassis fan phenomena is all too familiar to me. The PcProbe
seems to have difficulties reading the chassis fan rotation speed if
the speed is low. I have 12 cm fan doing 1000 rpm/min and the PcProbe
shows bizarre readings between -28000 - 6600 rpm/min.

Now I have a p4p800 standard board, but I had a7n8x-deluxe and it has
the same problem. I think there are 2 possibilities: wether the
controller chip is unable to detect low speed accurately or PcProbe is
the reason behind the things. Anyway my PC works great, I just had to
disable chassis fan monitoring.

Greetings

Tatu