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Cooler Master N520 only has 3 pin

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May 25, 2010 7:04:38 AM

Hey everyone

I bought a Cooler Master N520 for my cheap rig. Then I just found out that it only has 3 pin to power both fans (push/pull). I need a 4 pin so the mobo can control the cpu fan speed depending on the cpu temp. It's too loud right now because it's doing 100%. Is there an adapter or something to deal with this?

Thanks a lot

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May 25, 2010 7:24:30 AM

I'm not sure if such things exist, probably, but I'd suggest that you will get a fan controller instead.
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May 25, 2010 8:11:19 AM

4pin fans = PWM
3pin fans = DC

both are backward compatible , you just need to set fan type to DC in the BIOS, or enable Q-fan/smart-fan.

you do NOT need a 4-pin connection for controlling the speed of your fan
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May 25, 2010 9:55:00 PM

Arterius2,

I have already tried to enable the SMART fan in the BIOS, but it's still running at full speed @ 1800RPM. There might be something wrong with my motherboard. It's a Gigabyte G41M-ES2L and I'm using a Core2duo E7500 2.93GHZ @3.6GHZ

Thanks
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May 26, 2010 2:17:40 AM

is there an option somewhere that you can set which fan type?

for example, Voltage vs PWM, i know in my gigabyte mobo, under pc health, you can choose.
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a b à CPUs
a b K Overclocking
May 26, 2010 9:19:54 AM

arterius2 said:
4pin fans = PWM
3pin fans = DC

both are backward compatible , you just need to set fan type to DC in the BIOS, or enable Q-fan/smart-fan.

you do NOT need a 4-pin connection for controlling the speed of your fan


I learnt something new today. Thanks for the info, I'm going to see if I can control my ridiculously loud Sickleflows.
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May 26, 2010 12:55:43 PM

yes, the extra pin on the PWM fans is to allow your mobo to control fan speed through a "pulse" method, that turns your fan on and off, on and off, thus reaching a specific rpm that way. this method is more energy efficient and creates less heat.

DC fans do that not have this, and the only way to control fan speed is through voltage adjustment, lower voltage = slower rotation, higher voltage = higher rotation.
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June 3, 2010 6:25:39 AM

rob11rod said:
Hey everyone

I bought a Cooler Master N520 for my cheap rig. Then I just found out that it only has 3 pin to power both fans (push/pull). I need a 4 pin so the mobo can control the cpu fan speed depending on the cpu temp. It's too loud right now because it's doing 100%. Is there an adapter or something to deal with this?

Thanks a lot

Thats a nice cooler why would you put it in a cheap rig.
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