Bios cpu fan regulation!!!! Asrock g41m-s

[miguelrostock]

Hello,
I´m having a problem with my asrock g41m-s.
When i start my computer, the cpu fan works on the maximal rpm(around 4300 rpm)!! And it doesn´t change when the O.S. (w7 32 bits is working). That´s why it´s too loud, and it´s absolutely impossible to work with it because of the noise.
I now i can change the rpm within the bios, but I don´t find how!!!
Can you help me???
Thanks

[ASRock TSD - Emily]

Dear miguelrostock,

G41M-S can support 4-Pin CPU-fan (Quiet Fan function), please kindly refer to below link for user manual page 22.
Link: http://download.asrock.com/manual/G41M-S.pdf

Please kindly check whether your CPU fan is 4-pin CPU fan or not.
If yes, please kindly refer to below link for user manual page 46 to adjust your CPU fan speed.
Link: http://download.asrock.com/manual/G41M-S.pdf

If any question, please kindly contact me.
Thanks!

Have a nice day
ASRock TSD
Emily

[Giuliano69]

I would kindly add my case.
I took a AsRock G41M-GS3, to revamp a Acer Extensa 264. The FAN is always on at MAX speed.

1) I connected the Acer fan&heat sink ("hi 3670c.001 rev a foxconn 2099") 4 wires connector, to the cpu_fan 1 connector. (The black wire is connected to 1 pin, (GND))
Noticed that the FAN is always on at MAX speed.
2) I checked the bios setting activating the quite fan CPU. Nope.
3) I re-flashed the bios, but no result.


What else could I test ?
The fan is working perfectly on the Acer MB...... maybe a different pin assignment ? ( the wire/pins are : 1-blk, 2red, 3-yellow, 4 blue)

From Acer support tech service, the fan seems to be
FAN COOLER P4_SKT775 PKP367 W/I SUNON 4000RPM HI.3670C.001
and the heat sink
Fan Cooler LGA775 TMD06 Fan 9225 HI.10800.006


What could suggest the AsRock tech. support ?

--- EDIT
In the bios page I can see the CPU temp (30°C) the fan speed (4200RPM), and the set point temperature (50°C).
But the fan still runs at full speed...

[Giuliano69]

I noticed that setting in the bios the target speed to slow, the fan speed remains constant, but at lower level (4200->3600).
So it seems that the pwm circuit is modulating the pulse, but the duty cycle of the pwm is always constant ,and not following the cpu temperature....

I would like to SLOW down the cpu fan.
Is it possible to have a workaround, inserting a RESISTOR on the fan +12V line, to lower the cpu speed.
Which Ohm value do you suggest ?