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Are Noctua NF-P12 redux-1700 PWM zero RPM mode fans?

Mark Kaine

I need replacement fans for my bottom intake to cool my GPU (3070) i currently have some Lepa fans installed which are ok, but their min speed is 600RPM, so I want to make sure the replacement fans can actually turn off completely when the GPU is not in use, i found the info for some other Noctuas (they do *not* turn off completely) but i cant find the info for the redux ones...

 

20210505_143131.thumb.jpg.1e6e1f40b640abb91adc4bc67d9c304c.jpg

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6 minutes ago, Mark Kaine said:

I need replacement fans for my bottom intake to cool my GPU (3070) i currently have some Lepa fans installed which are ok, but their min speed is 600RPM, so I want to make sure the replacement fans can actually turn off completely when the GPU is not in use, i found the info for some other Noctuas (they do *not* turn off completely) but i cant find the info for the redux ones...

If you want the fans to turn off, you need to specify that in BIOS. Fans respond to the voltage/PWM signals they're given, and don't have any "smarts" to enter zero-RPM mode without being told.

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7 minutes ago, Mark Kaine said:

I need replacement fans for my bottom intake to cool my GPU (3070) i currently have some Lepa fans installed which are ok, but their min speed is 600RPM, so I want to make sure the replacement fans can actually turn off completely when the GPU is not in use, i found the info for some other Noctuas (they do *not* turn off completely) but i cant find the info for the redux ones...

 

20210505_143131.thumb.jpg.1e6e1f40b640abb91adc4bc67d9c304c.jpg

As far as I'm concerned, the "zero db" features is upto the motherboard bios or what ever fan controller you plug the fan in like Corsair icue

01110100 01101000 01100001 01110100 00100000 01110111 01100001 01110011 00100000 00110111 00110000 00100000 01101001 01101110 01100011 01101000 00100000 01110000 01101100 01100001 01110011 01101101 01100001 00100000 01110011 01100011 01110010 01100101 01100101 01101110 00100000 01110100 01110110

 

 

 

 

 

 

 

 

 

 

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34 minutes ago, AbydosOne said:

If you want the fans to turn off, you need to specify that in BIOS. Fans respond to the voltage/PWM signals they're given, and don't have any "smarts" to enter zero-RPM mode without being told.

 

34 minutes ago, Liam danu said:

As far as I'm concerned, the "zero db" features is upto the motherboard bios or what ever fan controller you plug the fan in like Corsair icue

eh, not really, some fans have specified minimum RPM, such as the Lepa (600 minimum) or the other Noctua(1400 minimum!)... the problem is the info is sometimes not given , i guess i have to dig some more then, as i couldn't find the info for this specific fan yet.

 

 

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I found something

 

362230937_Screenshot_20210505-153552_SamsungInternetBeta.thumb.jpg.bce657fccdb2faa0a3bdfaaa6f4da6a8.jpg

 

still not really conclusive... looks like the 900 arent pwm and the 1700 indeed have *minimum RPM*  of 450, oof.

 

Edit:  i guess i get what you're saying , but my current PWM fans will *not* ever turn off, theyll be 600rpm minimum...

 

i do know silent wings 2 (3pin) do turn off completely on the same fan header, so i either need to buy those (apparently my exact model isnt available anymore tho) or i have to swap some fans, and hope it works.  

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13 hours ago, Mark Kaine said:

eh, not really, some fans have specified minimum RPM, such as the Lepa (600 minimum) or the other Noctua(1400 minimum!)... the problem is the info is sometimes not given , i guess i have to dig some more then, as i couldn't find the info for this specific fan yet.

The minimum rpm refers to the lowest rpm the fan can run at. Below the minimum rpm, the fan stops spinning. 

Depending on your motherboard, there may be a setting to enable fan stop. Some motherboards don't allow for very low fan speeds. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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5 minutes ago, WoodenMarker said:

The minimum rpm refers to the lowest rpm the fan can run at. Below the minimum rpm, the fan stops spinning. 

Right, i got confused with this , so what i think i really need to do is buy two 3pin fans, because im like 99% sure i tried that before and those actually stopped spinning on that header.

 

14 minutes ago, WoodenMarker said:

Some motherboards don't allow for very low fan speeds. 

i mean thats the thing, it works on any header with pwm or dc fans, except that one header only stops dc fans - if i remember correctlly.

i guess i should really try swapping the 3pin fans with the 4pin vans to be sure .

 

 

 

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4 minutes ago, Mark Kaine said:

Right, i got confused with this , so what i think i really need to do is buy two 3pin fans, because im like 99% sure i tried that before and those actually stopped spinning on that header.

3pin fans often have a higher minimum rpm since the the speed is lowered by lowering voltage. PWM uses 12v pulses which can keep the fan running at lower speeds.

Keep in mind that not using enough power to get the fan spinning can still heat the motor up. This can wear the fan out more quickly if not properly cooled. The fan usually cools itself when in operation. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
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8 hours ago, WoodenMarker said:

3pin fans often have a higher minimum rpm since the the speed is lowered by lowering voltage. PWM uses 12v pulses which can keep the fan running at lower speeds.

Keep in mind that not using enough power to get the fan spinning can still heat the motor up. This can wear the fan out more quickly if not properly cooled. The fan usually cools itself when in operation. 

But, what im supposed to do then? i have pwm fans (the Lepa) as the bottom intakes currently and they simply wont stop spinning, minimum always 600rpm.

 

So basically just take the risk with 3 pin fans of the fans wearing out faster?

 

I mean right now ive decided to simply not buy any new fans, but long term i need a better solution, while everything works at the moment this setup isnt ideal , for example i also need another fan for the "pull" on my cpu cooler , its currently not even connected to the cpu fan header because it just spins at full blast when i connect it (also a pure wings 3pin) and the bequiets *are* loud when run at full speed lol.

 

(just to show how it currently is, at idle)

 

Tldr, i believe only 3pin fans will work properly on the bottom intake, and ill also need a solution for the second cpu fan (probably pwm) , its a mess , and i think its because of the motherboard controls not really working as they should (msi b350m mortar) 

 

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12 hours ago, Mark Kaine said:

But, what im supposed to do then? i have pwm fans (the Lepa) as the bottom intakes currently and they simply wont stop spinning, minimum always 600rpm.

 

I mean right now ive decided to simply not buy any new fans, but long term i need a better solution, while everything works at the moment this setup isnt ideal , for example i also need another fan for the "pull" on my cpu cooler , its currently not even connected to the cpu fan header because it just spins at full blast when i connect it (also a pure wings 3pin) and the bequiets *are* loud when run at full speed lol.

Do the fans stop if you manually set the fan to 0%?

3pin fans run at 100% rpm when using pwm since it doesn't have the 4th pin and pwm ic to modulate the incoming 12v signal. Use dc / voltage control instead for 3pin fans. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
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18 minutes ago, WoodenMarker said:

3pin fans run at 100% rpm when using pwm since it doesn't have the 4th pin and pwm ic to modulate the incoming 12v signal. Use dc / voltage control instead for 3pin fans. 

yeap i understand the issue of the cpu fan, it's because the header is pwm only, so the noctua fan (push) works properly but the bequiet 3pin will run at 100%.  i managed to put that on another header and its spinning roughly at the same speed than the noctua. 

Funny thing is i can set the cpu header to dc, which will make both fans stop spinning (when connected to the cpu header) lol ... I don't think thats supposed to happen , but happens  regardless. It just makes me think something is dodgy with this motherboard.

 

18 minutes ago, WoodenMarker said:

Do the fans stop if you manually set the fan to 0%?

The bottom intakes are pwm and the header is set to pwm, and no, they do not stop spinning if i set them to 0, they are always running at 600pm minimum, which is what i dont understand.

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11 minutes ago, Mark Kaine said:

yeap i understand the issue of the cpu fan, it's because the header is pwm only, so the noctua fan (push) works properly but the bequiet 3pin will run at 100%.  i managed to put that on another header and its spinning roughly at the same speed than the noctua. 

Funny thing is i can set the cpu header to dc, which will make both fans stop spinning (when connected to the cpu header) lol ... I don't think thats supposed to happen , but happens  regardless. It just makes me think something is dodgy with this motherboard.

 

The bottom intakes are pwm and the header is set to pwm, and no, they do not stop spinning if i set them to 0, they are always running at 600pm minimum, which is what i dont understand.

What fan curve are you using with the dc setting? As mentioned, the minimum rpm is generally higher with dc. 

Check and see if there's a setting that disables fan stop. If there isn't, it may be that the fan doesn't support 0% rpm with pwm. You can try dc instead or software like SpeedFan or Argus Monitor for 0rpm with pwm. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
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11 hours ago, WoodenMarker said:

You can try dc instead or software like SpeedFan or Argus Monitor for 0rpm with pwm. 

Thats something i wanted to try, because if that would let me control the bottom fans i wouldn't need to buy any obviously . Problem is i tried speedfan, didn't seem to work at all on my board (msi b350m mortar).so only Argus left....

 

Otherwise after some thinking , ill just need 1 3pin pure wings 2 , because i have one spare, so i can try those in the bottom and hopefully they'll work ,and i leave the cpu fans as is , its not ideal (because push pull is on 2 different headers) but its working pretty well otherwise.

 

And sorry for not answering your orher questions, im a bit confused which fans your asking about now, but any fans i have installed can go 0 rpm, except the 2 on the bottom  - which i think is because they are pwm, i know for sure i had *one* 3pin fan there and that stopped spinning when not under load no problem, so it shouldn't be a problem with two 3pin fans either?

 

And ill try Argus first though !

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On 5/7/2021 at 4:55 AM, Mark Kaine said:

i had *one* 3pin fan there and that stopped spinning when not under load no problem, so it shouldn't be a problem with two 3pin fans either?

3pin fans should be fine. The Lepa fans probably aren't stopping with how the pwm is implemented. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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