Noctua NF-F12 running at full speed always?

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naseem142

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Jan 30, 2015
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Hello,

I have an MSI H97 Pc mate , and i'm using the NF-F12 fan on the front panel to cool the PC.

I connected the 4-pin cable from the fan into a 3-pin connector on the motherboard , and the fan is always running at full speed , i tried going to the bios but that fan is not detected there.

How can i control this fan? help is really appreciated !
 
Solution
nukemaster
Sorry to say the board lacks the control required to control fans on those 2 port. They would need some kind of regulator to adjust voltage and it simply was never added to these boards.

You can use the included adapters from Noctua to slow the fans, but they will operate at one speed only.

Some companies make PWM to 3 pin hubs and adapters to allow the second cpu fan or first system fan header to control 3 pin fans(many times more than one), but that just adds another device to the system.

EDIT.
Just so you know they also make manual and automatic(normally come with temperature sensors) fan controllers.
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nukemaster

nukemaster

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Nov 23, 2004
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Your boards 3 pin headers do not control fans(they just feed constant 12 volt). The SysFan1(not an actual PWM header since it does not use pin 4) 4 pin will control a 3 pin fan however.

2m5jfhc.jpg
 
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nukemaster

nukemaster

Titan
Nov 23, 2004
19,626
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74,965
Sorry to say the board lacks the control required to control fans on those 2 port. They would need some kind of regulator to adjust voltage and it simply was never added to these boards.

You can use the included adapters from Noctua to slow the fans, but they will operate at one speed only.

Some companies make PWM to 3 pin hubs and adapters to allow the second cpu fan or first system fan header to control 3 pin fans(many times more than one), but that just adds another device to the system.

EDIT.
Just so you know they also make manual and automatic(normally come with temperature sensors) fan controllers.
 
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Solution
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naseem142

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Jan 30, 2015
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I will just get a fan controller i guess , but one more question if you don't mind. Can i plug the fan into a CPU fan connector? will that work? It has a fan controller and cpu fans are just like normal fans arent they?
 
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Andrei-Florin Gogan

Andrei-Florin Gogan

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Sep 25, 2014
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You can plug the fan into the CPU header but if you get a fan controller then it's no point. If you plug a fan into a CPU fan header on motherboard, it will work but if the fan fails in any way, you will get a warning or even a shutdown of the PC. This depends on BIOS settings.
 
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nukemaster

nukemaster

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Nov 23, 2004
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If your fans are 3 pin they will run full speed on the cpu and cpufan1/2 connector.

They have 2 ways to control fan speed.

One uses voltage(so running a 12 volt fan on 6 volts will run it slower). In general most fans will make it down to about 5 volts(smaller ones may not start at this voltage and some can go lower). Most board swill try to start with a higher voltage and then lower it to the desired speed because that avoids stalling the fan.

The other way to control it is with onboard electronics in the fan it self. In this case a signal(going from ground to a set voltage[may be 3.3 or 5 in most cases]) controls the speed. This works very much like a switching power supply so the fan will have power a certain percent of its duty cycle. Even in the off time the fan never stops and the frequency is set high enough that we should not hear the PWM action. This method is more efficient and can offer a very wide speed range with some fans.
 
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naseem142

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It is a 4-pin and worked fine when and i put it into the cpu connector and can control it now :)

But thanks for the valuable information!
 
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