How to connect Molex 3 pin to PSU?!?!

uves2112 · Jul 25, 2016

http://www.amazon.in/Generic-4-Pin-Chasis-Connector-Cables/dp/B019EV7G34?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

Hello,

The above link will guide you to the molex pin I bought. I bought this so I can attach an additional case fan to my pc, i am out of all fan extensions. It is for a gaming pc.

After researching I found that a molex pin can attach a case fan to psu, I ordered one. I am able to attach the case fan to molex but now I do not know how to attach this molex to PSU.

Do i need to attach a SATA cable to molex to be able to attach it to the PSU?

Please help noob here.

Paperdoc · Jul 26, 2016

First, I presume you have all your case fans connected directly to PSU outputs, and not to any mobo fan headers. This gives you no control over fan speeds since all of them will run full speed all the time when connected this way. However, you did not ask about changing that detail.

Next, I'm assuming that you have made those connections of fans to PSU 4-pin Molex outputs, and now have run out of that output connector type. If that is so, what you really need are splitters. You should know that 4-pin Molex outputs can supply a LOT of power each, so it it entirely acceptable to connect many case fans to ONE Molex output. This is done with splitters. There are three ways to go. This one:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812493091&cm_re=Molex_splitter-_-12-493-091-_-Product

will convert one PSU 4-pin Molex output into three of them, and then you can use an adapter such as you linked to connect from each splitter output to a 3-pin fan.

Another way is with a splitter that starts from a fan connector, like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812162059&cm_re=fan_splitter-_-12-162-059-_-Product

That one you would plug into the end of your existing adapter (like you linked) to convert its single fan output into three outputs. Although it is designed for 4-pin fans, it will work just as well for 3-pin ones.

And finally, this item:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812493026&cm_re=Molex_fan_adapter-_-12-493-026-_-Product

converts one PSU 4-pin Molex output directly into three 3-pin fan outputs all in one adapter.

uves2112 · Aug 5, 2016

Paperdoc :

First, I presume you have all your case fans connected directly to PSU outputs, and not to any mobo fan headers. This gives you no control over fan speeds since all of them will run full speed all the time when connected this way. However, you did not ask about changing that detail.

Next, I'm assuming that you have made those connections of fans to PSU 4-pin Molex outputs, and now have run out of that output connector type. If that is so, what you really need are splitters. You should know that 4-pin Molex outputs can supply a LOT of power each, so it it entirely acceptable to connect many case fans to ONE Molex output. This is done with splitters. There are three ways to go. This one:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812493091&cm_re=Molex_splitter-_-12-493-091-_-Product

will convert one PSU 4-pin Molex output into three of them, and then you can use an adapter such as you linked to connect from each splitter output to a 3-pin fan.

Another way is with a splitter that starts from a fan connector, like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812162059&cm_re=fan_splitter-_-12-162-059-_-Product

That one you would plug into the end of your existing adapter (like you linked) to convert its single fan output into three outputs. Although it is designed for 4-pin fans, it will work just as well for 3-pin ones.

And finally, this item:

http://www.newegg.com/Product/Product.aspx?Item=N82E16812493026&cm_re=Molex_fan_adapter-_-12-493-026-_-Product

converts one PSU 4-pin Molex output directly into three 3-pin fan outputs all in one adapter.

No all of my fans are connected directly to the mobo, I said I am out of fan connectors, hence I am trying to connect to the PSU.

Paperdoc · Aug 8, 2016

OK, that's a different question. Now my understanding is that you have several fans already plugged into mobo fan headers so that all those headers are used up. Your problem is how to add more fans with no mobo headers available, right?

To be sure to give the right advice I need to know three things:
1. Exactly what mobo - maker and model number - do you have? With that I can look up its manual and find details on how its fan headers work.
2. What fans do you have already connected - maker and model numbers, please - and how many? It would help if you can tell me also how many wires come out of each of those fans to their connectors - normally either three or four.
3. How many fans, and of what type, do you plan to add?

Here's a bit of background so you know why I ask for this info. Almost all mobo fan headers can supply enough power to allow you to connect two or three "normal" case ventilation fans to each such header, using simple splitters. But it is important to match the fan type (3-pin or 4-pin) to the types of mobo header in use. Sometimes the mobo header type is tricky to discern, so that's why I need to see its manual. The tricky part I'm checking is what happens when you don't match the types. A 4-pin fan can be controlled by either type of mobo header (3-pin Voltage Control Mode or 4-pin PWM Mode), but a 3-pin fan can only be controlled properly by a 3-pin header. A 3-pin fan plugged into a PWM Mode header can only run at full speed all the time. Further, sometimes the way to use many fans is to employ a different device, a 4-pin Hub, rather than a Splitter. But to do that you MUST have a 4-pin mobo header that truly does use PWM Mode, AND you must be using 4-pin fans. So, with the details I asked for above, I can give you the right answers I hope.

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How to connect Molex 3 pin to PSU?!?!

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