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Connecting 4 pin fan to molex?

post #1 of 5
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I have one extra chassis fan that is a female 4-pin and there's no space left on my motherboard. Is there a 4-pin to molex adapter?

I have a 3-pin one and as far as I know the 4th pin is for PWM only and this should work.

But before I blow something up I thought I'd check here first to make sure this is ok to do.

The one I have is like this by the way :

http://www.newegg.com/Product/Product.aspx?Item=N82E16812201009


Thanks!
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post #2 of 5
I'm sure it would be ok to do, but don't take my word since I'm no electrician. But my Cougar Vortex 120mm came with a 4 pin PWM to Molex adaptor. (The adaptor only puts 2 pins into the female of the fan, so to speak.)

Hope this helps. smile.gif

EDIT : looked at your link, yup, pretty much what I have too. I have just tried plugging it it now and worked fine. PWM fan ran at full with molex.
Edited by neo0031 - 5/6/13 at 5:18pm
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post #3 of 5

Or you can get a "PWM Splitter." That plugs into Molex to get 12v power, and into your motherboard header to get a 5v PWM signal, which it then distributes to the fans.

 

I have such a PWM splitter in my rig. The two heatsink fans and a top intake fan are all controlled by the motherboard. They spin up when they are needed; otherwise they are quiet. I like the setup.


Edited by ehume - 5/10/13 at 4:07am
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post #4 of 5
What ehume said. Everything I build now is PWM with motherboard CPU fan PWM control and sometimes CPU/GPU PWM control thumb.gif
post #5 of 5
If you need to run several groups of fans from Swiftec and other splitters your case is going to get crowded fairly quickly, but if you are prepared to set up a crimping and soldering toolkit and build up a stock of stripboard, wire, sleeving and connectors it is amazing just how much cash and time spent waiting for delivery can be saved.

A basic, but slightly more versatile PWM chain can be put together using 8mm ID x 11mm OD plastic tube that simplifies the whole arrangement.




Edited by Himo5 - 5/18/13 at 7:45am
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