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Pwm fans

post #1 of 9
Thread Starter 
I need a quick explanation on pwm fans since I'm new to pc building. For a pwm fan to work does it absolutely need a pwm controller or will it work just by plugging it in the mobo. Can any fan work by having a pwm signal sent to it or does it have to be a pwm fan. A just recently became aware of pwm fan and I'm trying to get more info on it and can't seem to find anything on the web

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post #2 of 9
No, you don't need a PWM Fan controller, the mobo will work as well, but you'll probably need a software to control it. You could even hook it up directly to the PSU, but the fan would be on max RPM in that case.
And about your second question, a regular fan won't have the extra PIN to regulate speed, but you can hook it up to the same PWM header, just usually leaves one or two pins out.
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post #3 of 9
Thread Starter 
So a pwm fan has 4 pins. So I guess I need a mobo with 4 pins connection. Since my mobo only has 3 pins case fan connection it won't regulate the speed and will run max rpm right???? If I understood well loll

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post #4 of 9
you need a 4 pin connector in ur mobo for having control over the PWM fan... another way to control it is a fan controller like this http://www.amazon.com/Sunbeamtech-PL-RS-6-Rheosmart-Fan-Controller/dp/B004LKZESI/ref=sr_1_9?ie=UTF8&qid=1375540210&sr=8-9&keywords=fan+controller
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post #5 of 9
3pin 4pin not the issue.

PWM is pulse-width modulation. The fan has 4 pins; ground, 12v, RPM signal out and PWM signal in.

Fan runs on 12v power only. The RPM signal from fan goes to motherboard which has a PWM processor that determines what the PWM signal need to be. The PWM signal goes to a circuit board in the fan that controls the 12v power pulses that run the fan motor.. a few short pulses run fan slowly, more and longer pulse makes fan run faster.

PWM fans usually run fine on 3pin / voltage control fan controllers.. but not always.

Just because motherboards have 4pin fan sockets does not mean they are PWM.

Many motherboards have 4pin sockets but do not have PWM signal going to all 4th pins.

You can run many PWM fans on same PWM signal using a PWM splitter with Molex / Sata power socket. They have a plug to motherboard PWM socket, Molex / Sata socket for PSU to plug into, and a bunch of fan sockets to plug fans into with one being the "master" socket.. the one that give motherboard it's RPM signal. All fans use same PWM signal to control their circuit board that controls the 12v power from PSU.
post #6 of 9
Thread Starter 
My cpu cooler is a 4 pin and pretty sure it's pwm. So I could put a 4 pin splitter and power 2 more fans??

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post #7 of 9
Quote:
Originally Posted by Ridingmac View Post

My cpu cooler is a 4 pin and pretty sure it's pwm. So I could put a 4 pin splitter and power 2 more fans??

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They can be simple splitter for 2 fans, or 4 fans, or Swiftech 8 fans
post #8 of 9
Thread Starter 
Am I seeing right the swift tech 8 way plugs in a sata port?? Is it for a fan control software??

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post #9 of 9
It connects to Sata cable from PSU.

You can get it with molex too

Edited by doyll - 8/3/13 at 9:33am
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