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Noctua fans are loud?

post #1 of 15
Thread Starter 
So I have an open water loop with 2 double radiators, and both are being cooled by noctua fans. I have two of the old case fans helping with general airflow, and all of these fans are hooked up to my fractal design fan controller. When I turn them down all the way, my computer becomes virtually silent, except I can hear a faint hum. At first I thought it was the pump, but after listening closer and poking around, I discovered it was the fans. At full blast they don't make that noise, but anywhere under that the hum comes back. The two fractal design case fans that I already had do not do this, and I'm pretty sure that the noctua fans use pwm while the fractal fans just have a steady motor.

Anyway, I wanted to know if this was common at all for noctua fans, or if maybe I could try a different fan controller and fix this problem. Thanks for the help!
post #2 of 15
I do not think that it is so much the fans, but rather the fact that the air is moving through the radiator. Forcing air through anything is bound to generate some noise.
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post #3 of 15
Thread Starter 
No, I'm positive it's not that. I stopped the fan with my hand, and when it tried to start up again, I heard the hum as the motor was activated.
post #4 of 15
NF-F12 I guess?
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post #5 of 15
Thread Starter 
Yes, the "performance" series (both 120mm and 140mm)
post #6 of 15
The NF-F12s is known to have more wind noise due to the focus flow vanes. NF-A14s and NF-A15s don't seem to have the problem because they don't have said vanes.

The stator guide vanes have the same effect as a wire grille in terms of noise.


* If they are making buzzing/humming motor type noise, you have every right to ask Noctua about it to get a new set of fans.

Compare to these sound clips:
http://www.youtube.com/watch?feature=player_embedded&v=cwT0mfr-YhY (source: http://martinsliquidlab.org/category/fans/)
http://www.silentpcreview.com/files/sounds/hsf/noctua-nh-u12s-7v-8v-9v-12v.mp3 (Source: http://www.silentpcreview.com/article1343-page6.html)
http://www.youtube.com/watch?v=gkoGccjRVSs (source: http://www.coolingtechnique.com/recensioni/74-ventole-rheobus/1020-noctua-pwm-il-controllo-a-onda-quadra-secondo-noctua.html)
http://www.youtube.com/watch?v=iiXNYrY-FzY

edit: also Cyclops says that NF-F12s are bad in pull.
Edited by AlphaC - 6/3/13 at 6:55pm
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post #7 of 15
Thread Starter 
No, it's definitely not the wind sound. If it is the fans themselves, that means I got 6/6 bad eggs from noctua, and I don't think that's very likely. Can different fan controllers cause this, or is it always the fan?
post #8 of 15
Noctua fans aren't necessarily loud, they just are run low speed. They aren't very good fans except in open air (ironically), and they are especially atrocious for their price. Yateloons literally beat them on heatsinks (better static pressure+cfm to sound ratios).

Noctua fans perform best on low speeds in open air. As in, relative to other fans. Yate loons are just higher quality fans for way cheaper (there might be a low speed point here or there in open air where noctuas perform slightly better but by and large...).

That said they aren't terrible (until you factor in that price).
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post #9 of 15
Belial I don't know what you mean, the RPM range is a standard 1300-1500RPM maximum for NF-F12, NF-A15, NF-A14 PWM.
NF-F12: http://www.noctua.at/main.php?show=productview&products_id=42&lng=en&set=1

NF-A14:http://www.noctua.at/main.php?show=productview&products_id=65&lng=en&set=1
NF-A15: http://www.noctua.at/main.php?show=productview&products_id=54&lng=en&set=1

When they're going for $20 it's not THAT bad for what you get: a quiet PWM fan with no click + sleeved PWM splitter + sleeved PWM extension + 6 year long warranty from a respected company.
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post #10 of 15
Quote:
Originally Posted by dullahan View Post

No, it's definitely not the wind sound. If it is the fans themselves, that means I got 6/6 bad eggs from noctua, and I don't think that's very likely. Can different fan controllers cause this, or is it always the fan?

I had a 4 pin fan that had some motor noise (clicking/buzzing) when on one 1 of my MOBO 4 pin headers. Switched it to another header and no issue. Maybe try another header or power source.
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