asus cpu fan very loud

[randomg]

I have a CM6870 desktop. For some reason, the CPU fan always runs at high speed. I tried minimizing cpu fan speed using speedfan, and it doesn't go below 3500rpm.

I tried modifying the bios settings. I saw an option for "Clean Level" and tried modifying it to "Disable", "Silent". Still I can't reduce the fan speed.

Please let me know if you have any pointers?

 

[romirez]

Can you open the case and see what kind of cooler installed there? How much pins it have? Where connected?

 

[randomg]

Can you open the case and see what kind of cooler installed there? How much pins it have? Where connected?

Thank you for the response. The cooler has "13071-002201DP" written on it which looks like a model number: http://www.asusparts.eu/Asus-13071-002201DP. It has 4 pins connected to motherboard.

 

[romirez]

4pins= RPM must work.
BTW check if it connected to CPU_FAN connector on motherboard.
Cant get any info on that cooler.
So, best way to test if cooler is bad - to use another 4pin cooler.
No need to remove radiator from CPU, just disconnect CPU_cooler from motherboard and connect another cooler with 4 pins.

Notice: Dont forget to track temperature of CPU to not overheat him.

 

[randomg]

4pins= RPM must work.
BTW check if it connected to CPU_FAN connector on motherboard.
Cant get any info on that cooler.
So, best way to test if cooler is bad - to use another 4pin cooler.
No need to remove radiator from CPU, just disconnect CPU_cooler from motherboard and connect another cooler with 4 pins.

Notice: Dont forget to track temperature of CPU to not overheat him.

Cooler is connected to CPU_FAN outlet. I was trying to experiment, but the motherboard doesn't have any other 4 pin outlet. By the way, RPM does work -- by changing the % in speedfan, I can increase & decrease the fan-speed, except that the speed doesn't go below 3500 rpm even if I manually set the % to 0.

I will try connecting a different cooler. Do you have any recommendations on a quieter cooler that I can purchase?

Also, do you know of any other s/w suites for controlling fan speeds? My default Asus Suite doesn't include "fan xpert", so I tried installing it and ran into an error "fan xpert doesn't support this model".

 

[romirez]

In your situation is better to use hardware methods of reducing RPM.
1. Fan speed reducer

2. Fan controller

 

[randomg]

Thank you romirez. As a temporary solution, I connected the CPU cooler to CHA_FAN1 and Chasis Fan to a direct power source. Even though CHA_FAN1 has 3pins, it has PWM and the dynamic range is much higher. Speed (or rpm) goes to zero if I manually reduce the % in speedfan to zero. So, it seems like Cooler is okay and the problem is with the CPU_FAN connector since it's not sending the right control.

I added a control in speedfan to adjust the speed based on cpu temperature, and this seems to work for now. I don't hear the loud noise when the computer is idle. Thanks much for your help, I appreciate it.