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How to connect 3-pin fans to the PSU

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November 4, 2013 3:36:38 AM

So, I bought a new build recently, and along with the 2 fans given in my case, I bought three more. The only problem is I don't have enough motherboard connectors to supply all these fans. So, I have two fans that would be blowing air from the top of my case unplugged. My solution was to plug my two remaining fans into the PSU, but I ave no clue how to do that.( First Time Builder) My PSU: Thermaltake SMART 750w Bronze ATX
Fans unplugged: Arctic Cooling F12

More about : connect pin fans psu

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November 4, 2013 3:42:31 AM

you need to buy a 3-pin to molex connector

Be cautious that if you connect your fans to the PSU they will be on full power all the time

make sure that your PSU has the require amount of Molex connectors as well

3-pin to molex adapter: http://www.amazon.com/3pin-power-4pin-molex-adapter/dp/...
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November 4, 2013 3:46:03 AM

The problem with connect most fans to the PSU is that they won't be temperature controlled, they'll just spin at full speed all the time.
For this reason you might want to have a look at some fan controllers, some of these will let you connect multiple 3-pin fans using a molex connector which makes hooking them up a bit easier, and let you either control the speed manually with controls that go on the front of your computer (usually with a 5.25" front plate) or you can get some that include temperature probes so you can set a target temperature for the fans to base their speed upon.

How many fans do you actually have in total though, and in what arrangement? IMO two motherboard fan connectors is usually enough for connecting two big fans, one at the front of a case and one at the back (including big dual fans if you can fit them), as quantity of fans isn't as important as getting strong steady airflow, and usually limiting it to one direction works best. I'd only recommend using more individual fan units if your case is separated into sections (or you've done that yourself) since those can operate independently.
Also, depending upon the fans you're using and the components in the case sometimes all you need are exhaust fans at the back as they'll pull air in at the front anyway, though the front fan working in tandem can help if that's not enough.
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November 4, 2013 3:52:46 AM


Haravikk said:
The problem with connect most fans to the PSU is that they won't be temperature controlled, they'll just spin at full speed all the time.
For this reason you might want to have a look at some fan controllers, some of these will let you connect multiple 3-pin fans using a molex connector which makes hooking them up a bit easier, and let you either control the speed manually with controls that go on the front of your computer (usually with a 5.25" front plate) or you can get some that include temperature probes so you can set a target temperature for the fans to base their speed upon.

How many fans do you actually have in total though, and in what arrangement? IMO two motherboard fan connectors is usually enough for connecting two big fans, one at the front of a case and one at the back (including big dual fans if you can fit them), as quantity of fans isn't as important as getting strong steady airflow, and usually limiting it to one direction works best. I'd only recommend using more individual fan units if your case is separated into sections (or you've done that yourself) since those can operate independently.
Also, depending upon the fans you're using and the components in the case sometimes all you need are exhaust fans at the back as they'll pull air in at the front anyway, though the front fan working in tandem can help if that's not enough.


I have 5 fans in all the two not working would be pushing air down from the top of the case. They are 120mm fans. I have to in the front currently pushing air into the case, which are both 120mm. I have a 120 mm fan on the back exhausting air. Also, I have no problem with the fans running at full speed because my case is very good for reducing sound.

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November 4, 2013 10:37:20 AM

Fan controllers are also a great option. Which allow you to control all your fans, and reduces the need to buy 3-pin to molex adapters.

Fan controllers usually come with 4 to 5 3-pin adapters which you connect your fans to. Then it you connect the controller to your PSU using a molex adapter(in most cases) this saves you having to using multiple molex adapters and keep your wiring more clean.

the NZXT Sentry 2: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Can be a useful option
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