Hi,
I know this question has the long pedantic answer, so I'll try and address that.
I know the motherboard and/or fan controller has to be configured to allow full stop 0 duty cycle PWM. I know the fan does not have to support it under the spec. However I know that some fans WILL stop when sent 0 duty cycle and others will not.
For example. NZXT radiator fans, will not stop, nor will their pumps. They will idle at around 800-1000rpm instead. The only way to stop them is to cut the power to the fan header.
Corsair rad fans are similar.
The motherboard will NOT allow you to configure the main CPU fan or pump headers to 0rpm anyway.
However the Artic F14 PWM fans I have in a previous system WILL stop dead at 0 PWM. They also start fine when raised to 20% duty cycle without stalling or 'cogging'.
The F14s seem hard to get these days with sellers selling them at £20 each. The new one is the C14? There is no documentation as to whether or not they support full stop. I have read that they disabled that full stop functionality before people (stupid people) were returning them as DOA. That would be extremely disappointing.
These are for case fans. They are only required to be running at all under high loads to suppliment airflow for the twin main radiators.
2 intakes in the basement to try and pull as much air through the floor filter when the GPU rad fans are at full tilt, to stop dust being pulled in everywhere else.
1 exhaust at the VRM section to add additional airflow over the VRM section when the CPU rad fans (and thus CPU) are working hard.
EDIT: Mobo is a Crosshair VIII Wifi. Case is a define 7. So I have 8 fan headers, 2 pump headers and a PWM multiplexer in the case if those aren't enough! I have BIOS sensible boot defaults for fans and then have Argus Monitor and MSI afterburner taking over when windows boots.
I know this question has the long pedantic answer, so I'll try and address that.
I know the motherboard and/or fan controller has to be configured to allow full stop 0 duty cycle PWM. I know the fan does not have to support it under the spec. However I know that some fans WILL stop when sent 0 duty cycle and others will not.
For example. NZXT radiator fans, will not stop, nor will their pumps. They will idle at around 800-1000rpm instead. The only way to stop them is to cut the power to the fan header.
Corsair rad fans are similar.
The motherboard will NOT allow you to configure the main CPU fan or pump headers to 0rpm anyway.
However the Artic F14 PWM fans I have in a previous system WILL stop dead at 0 PWM. They also start fine when raised to 20% duty cycle without stalling or 'cogging'.
The F14s seem hard to get these days with sellers selling them at £20 each. The new one is the C14? There is no documentation as to whether or not they support full stop. I have read that they disabled that full stop functionality before people (stupid people) were returning them as DOA. That would be extremely disappointing.
These are for case fans. They are only required to be running at all under high loads to suppliment airflow for the twin main radiators.
2 intakes in the basement to try and pull as much air through the floor filter when the GPU rad fans are at full tilt, to stop dust being pulled in everywhere else.
1 exhaust at the VRM section to add additional airflow over the VRM section when the CPU rad fans (and thus CPU) are working hard.
EDIT: Mobo is a Crosshair VIII Wifi. Case is a define 7. So I have 8 fan headers, 2 pump headers and a PWM multiplexer in the case if those aren't enough! I have BIOS sensible boot defaults for fans and then have Argus Monitor and MSI afterburner taking over when windows boots.
Last edited:
