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connecting 3 and 4 pin fans directly to PSU

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  • Connection
  • Fan
  • Components
Last response: in Components
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May 12, 2014 9:39:06 PM

need to know what adapter to use to connect a 3 pin and a 4 pin fan directly to the PSU.

More about : connecting pin fans directly psu

May 12, 2014 9:46:05 PM

Edit: I have no idea. Please see the the very bottom of the thread for the discussion.
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May 12, 2014 9:48:12 PM

Hi jleegreene
You can buy cheap cables to run from a 4pin molex on your psu to either 3pin and or 4pin for your fan
such as these

or to multiple fans


you can get these molex to 3pin or molex to 4pin
and also at different voltages , 12V ,7V,5V
these reduce the speed of your fan thereby making it quieter if you so desire
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May 12, 2014 9:50:05 PM

it is not a bad idea to run fans off of a psu at all , there is nothing wrong with it , explain your reasoning as to why it is a bad idea ?
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May 12, 2014 10:03:40 PM

Edit: I have no idea. Please see the the very bottom of the thread for the discussion.
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May 12, 2014 10:06:24 PM

mickypheonix said:
Hi jleegreene
You can buy cheap cables to run from a 4pin molex on your psu to either 3pin and or 4pin for your fan
such as these

or to multiple fans


you can get these molex to 3pin or molex to 4pin
and also at different voltages , 12V ,7V,5V
these reduce the speed of your fan thereby making it quieter if you so desire


mickypheonix said:
it is not a bad idea to run fans off of a psu at all , there is nothing wrong with it , explain your reasoning as to why it is a bad idea ?


Thank you sir!
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May 12, 2014 10:12:47 PM

mickypheonix said:
it is not a bad idea to run fans off of a psu at all , there is nothing wrong with it , explain your reasoning as to why it is a bad idea ?


It's not technically a bad idea, but you have more control if you can plug it into your motherboard, as you most likely know (most likely = 99% chance).

For anyone glancing upon this in a random google search though, plugging a 3/4 pin into your motherboard and either tweaking your BIOS settings or using software like Speedfan to auto control your fans gives you a quieter system compared to full throttle on with a 3/4pin-molex connector or a fixed molex connector that won't allow you to change fan speed without physically changing adapters.

Fan controllers are also a good option if you don't want to do it software side.
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May 12, 2014 10:19:03 PM

I'm thinking of going the route of getting a fan controller. If i do, should i leave two of the fans plugged into the Mobo PWM/CHA fan headers, or should i just plug them all into the fan controller? does it really matter?

Brendan_14 said:
mickypheonix said:
it is not a bad idea to run fans off of a psu at all , there is nothing wrong with it , explain your reasoning as to why it is a bad idea ?


It's not technically a bad idea, but you have more control if you can plug it into your motherboard, as you most likely know (most likely = 99% chance).

For anyone glancing upon this in a random google search though, plugging a 3/4 pin into your motherboard and either tweaking your BIOS settings or using software like Speedfan to auto control your fans gives you a quieter system compared to full throttle on with a 3/4pin-molex connector or a fixed molex connector that won't allow you to change fan speed without physically changing adapters.

Fan controllers are also a good option if you don't want to do it software side.


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May 12, 2014 10:24:07 PM

Well, you want to try and have your CPU cooler fans run off the software, or BIOS so that it's auto controlled. It'll take a lot of experience and confidence in your judgement/temp sensors to control the cpu fans. Technically you can run as many as you want off the fan controller, but I'd stick to just case fans to control.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

This can provide some auto coverage if you want to stay completely out of the software. just make sure your sensors are taped down well.
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May 12, 2014 11:08:54 PM

Brendan_14 is correct you do have more control with your motherboard than a fan speed reducer , with a fan speed reducer you will have 12v,7v,or 5V ,3 set speeds, with the motherboard you can setup fan profiles and adjust the fan rpm to whatever speed you require.
A fan controller is a good option it will give you the option to control your fans with variable speeds.
As Brendan_14 said it is best to leave your cpu fan/fans plugged into PWM header for your cpu the motherboard so it will control the speed of your cpu fans so your motherboard can make the fans spin faster if the cpu gets hot or slow them down when not required to go at high speed
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