My fans are constantly breathing up and down ...

[jadc007]

Hi Guys,

I am not sure how i did it but I manage to get the fans to stop breathing up and down constantly but I had a bios reset and for the life of me cant remember how i managed to fix it

Specs

Asus Ranger VIII
4 PWMS 120mm
Coolermaster master air (2XPWM)

i tried playing with the QFAN on the bios and used the optimise fans with them all set to PWM's not DC mode this isn't working.

then tried the optimisation on the asus suite and still getting the same issue?
I am pretty sure it's the CPU rpm going up and down, these are all connected to the motherboard with the CPU fans being split in 1 .

Hopefully someone can help

 

[Paperdoc]

First, you should understand that fans that change speeds are doing it RIGHT! Automatic fan speed control by the mobo means that each fan's speed WILL change, according to the cooling demand, which depends on how much work the system is doing at that time. Such changes typically are in modest steps, not very small increments. The way that is done is that each fan header (CPU or CHA fan) is linked to a temperature sensor in the system, and it is those measured temperatures that drive the fan speed controls. The CPU_FAN is controlled according to the sensor built into the CPU chip itself. The mobo's CHA_FAN headers are controlled according to a different temperature sensor, normally. However, your mobo lets you choose which sensor is used for the case fan control system, and by default that is set to use the internal CPU temp sensor. This is not really the right way, but probably is what your system is doing after a BIOS Reset. See your manual Section 3.7 on p. 3-37 under "Chassis Fan 1-4 Q-Fan Source". Choose the "MotherBoard" option to set it to use the temperature sensor built into the mobo to control your case fans. Then hit the F10 key to SAVE and Exit, which will save your new setting and reboot your system.

After that, if you still find the fan speed changes annoyingly frequent, you could try a custom change. First, make sure you know which fan(s) you are trying to change. What may be happening is that the normal running temperature in your system is just on the edge between two ranges that call for different speeds, so it keeps changing with very small actual temperature changes. Now look at p. 3-37 of your manual under "CPU Fan Profile" if you want to customize the CPU fan speed controls, or on p. 3-38 under "Chassis Fan 1-4 Profile" if you want to change the case fan controls. In each case, the Profile normally is set to "Standard". If you change that to "Manual", then you can re-assign the settings for what temperatures will call for what fan speeds, and in that way alter when your fan speeds will change. Remember to SAVE and EXIT after making changes.

 

[jadc007]

Thanks for that paperdoc, really appreciated... sadly i didn't get round to fully testing it as I upgraded couple days after your post.

Hopefully this helps someone else with the issues trying to troubleshoot

 

[Paperdoc]

Thanks for Best Solution.