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post #631 of 2975
now i am confused, I have 2 of these fans that will be hear friday, i am going to plug each fan into it's own 3pin mother board fan header that i controll my 2 current fans with asus fan xpert. are the 2 Noctuas going to work for me in a 3pin fan header??
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post #632 of 2975
Quote:
Originally Posted by jlhawn View Post

now i am confused, I have 2 of these fans that will be hear friday, i am going to plug each fan into it's own 3pin mother board fan header that i controll my 2 current fans with asus fan xpert. are the 2 Noctuas going to work for me in a 3pin fan header??


Sure they will work. But you can control fans connected by 3pin only with Voltage. You need the 4pin PWM connection to control them with PWM.

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post #633 of 2975
Quote:
Originally Posted by jlhawn View Post

now i am confused, I have 2 of these fans that will be hear friday, i am going to plug each fan into it's own 3pin mother board fan header that i controll my 2 current fans with asus fan xpert. are the 2 Noctuas going to work for me in a 3pin fan header??

 

They work just fine; but Noctua PWM fans come with a 3 pin adapter for the LNA / ULNA. The fan itself has a 4th pin for the PWM function but 3 other pins like a standard fan. 

 

3 Pin transmits:

Voltage

RPM

Ground

 

The 4th pin missing from the LNA / ULNA adapters is the PWM wire that transmits the PWM signal to the fan. 

 

It'll work just fine with the LNA / ULNA on a 3pin or 4pin header from the board; but the fan is not receiving the PWM duty cycle signal, and instead the board is pulsing 12v to the fan to reduce the fan speed based on the frequency of the pulses. 

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post #634 of 2975
cool thanks everyone, I kinda figured they would work as the 2 fans i have in the 3pin headers now are 4pin, my mother board has only 2 4pin headers and 1 is for the cpu cooler fan and the other 1 is for the case exhaust fan so when case temp gets a little warm the bios will turn the exhaust fan up for me but my asus fan xpert allows me to controll all the 3 pin headers which is 4 and if i disable the 2 4pin headers in the bios i can control the 2 4pin headers and all the 3 pin headers with asus fan xpert which is a nice feature.
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post #635 of 2975
Quote:
Originally Posted by Tator Tot View Post

Quote:
Originally Posted by jlhawn View Post

now i am confused, I have 2 of these fans that will be hear friday, i am going to plug each fan into it's own 3pin mother board fan header that i controll my 2 current fans with asus fan xpert. are the 2 Noctuas going to work for me in a 3pin fan header??

 

They work just fine; but Noctua PWM fans come with a 3 pin adapter for the LNA / ULNA. The fan itself has a 4th pin for the PWM function but 3 other pins like a standard fan. 

 

3 Pin transmits:

Voltage

RPM

Ground

 

The 4th pin missing from the LNA / ULNA adapters is the PWM wire that transmits the PWM signal to the fan. 

 

It'll work just fine with the LNA / ULNA on a 3pin or 4pin header from the board; but the fan is not receiving the PWM duty cycle signal, and instead the board is pulsing 12v to the fan to reduce the fan speed based on the frequency of the pulses. 

I just went downstairs and looked. I have in retail boxes the NF-F12 PWM and the NF-P12 PWM. I am also testing the NH-L12. All have 4-pin Low Noise adapters.

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post #636 of 2975
Quote:
Originally Posted by ehume View Post

I just went downstairs and looked. I have in retail boxes the NF-F12 PWM and the NF-P12 PWM. I am also testing the NH-L12. All have 4-pin Low Noise adapters.

 

My F12 PWM came with a 3pin LNA. Probably a packaging error. 

 

Still, a 3pin connection wouldn't work because of the missing 4th pin. If yours has 4 pins, then it would work fine. 

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post #637 of 2975
That does indeed significantly help my understanding Ehume, thanks for taking the time to lay it all out.

I certainly understand that without the fourth pin, whether at the fan or the adapter, PWM is out of the question.

Both of my LNA's have four pins.
Edited by Cyril279 - 11/8/12 at 4:25am
post #638 of 2975


Here is my NH-D14 installed in my sig rig. I also have a NF-P12 and 2xNF-R8s
post #639 of 2975
is there a difference if i put the nh-d14 the other way cause that's were i have it
post #640 of 2975
Yeah, big difference.

This way blows back and your way blows up. biggrin.gif

Honestly, the ability to cool is the same. It's just where cooler draws air from and where it exhausts are different.

I originally ran my Phanteks exiting top because of exhaust vent sizes (120mm back and 2x 140mm top). Now I've cut out my back vent and turned it to the back. Temps are the same.
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