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Best way to connect chassis fans for 12V on each?

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  • Components
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April 2, 2014 12:27:33 PM

Hey, everyone!

I'm kinda new to the whole self-assembled PC-thing, so I have a few problems which may seem ridiculous to you.

I have an ASRock H87 Pro4 MoBo and a Corsair 230T case which has already 3x 120mm fans pre-installed. All three of them are connected to the MoBo ( 2 each on a ch-fan header and 1 on a pwr-fan header).

I want to install 3 more fans (Corsair AF-series; not because I'm overclocking anything; it gets pretty hot during summer where I live) but I don't know how to power them so all 3 extra fans run with 12V.

Will a molex to 3pin adapter provide 12V to each fan or only 5/7V?
Does a splitter reduce the voltage? What would the max. number of fans be I could connect via a splitter to one chassis fan header?

What is the most efficient way for me?

Thanks in advance!

More about : connect chassis fans 12v

April 2, 2014 12:33:49 PM

A splitter will not reduce the voltage. Both fans will spinn at thier max power if 12v is fed into the splitter.
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April 2, 2014 12:57:50 PM

MFBLO96 said:
A splitter will not reduce the voltage. Both fans will spinn at thier max power if 12v is fed into the splitter.


Thanks for the fast response!

So, it doesn't matter if I connect them via a splitter to the MoBo or via one of these molex-to-fan adapters directly to the PSU?

And under what circumstances is the voltage reduced? (never been good in physics at school :-/ ).
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April 2, 2014 1:05:01 PM

It would not matter which one as long as the fans get 12v. Motherboard ports will do this. And molex should. I would double check on the specific molex adapters as it could do 12 or 5v depending in the model
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April 2, 2014 1:23:21 PM

It would not matter which one as long as the fans get 12v. Motherboard ports will do this. And molex should. I would double check on the specific molex adapters as it could do 12 or 5v depending in the model

Oops, accidentally double posted
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April 2, 2014 1:33:23 PM

My Seasonic S12II 620W has 2 molex cables with each 3 connectors. Do they all supply 12V or could it be that one of them only delivers 5V? (I've checked the cables but there is no clue on them if there is a difference)

http://www.seasonicusa.com/S12II-Bronze.htm
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April 2, 2014 2:03:22 PM

Each molex plug supplies 5,7, and 12 volts through the multiple wires. A device will draw from which ever wires it needs to get the required voltage.
A fan adapter will draw from the two lines neccesary to get 12v

All of the connectors can supply the 12v
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April 3, 2014 7:10:33 AM

MFBLO96 said:
Each molex plug supplies 5,7, and 12 volts through the multiple wires. A device will draw from which ever wires it needs to get the required voltage.
A fan adapter will draw from the two lines neccesary to get 12v

All of the connectors can supply the 12v



Just to make sure again (I just want to make sure I understand you):

If I connect them to the PSU with a molex-to-fan adapter there's no way the voltage will be reduced without an extra adapter? (so basically any molex-to-fan adapter will work except the ones that are for voltage reduction)
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April 3, 2014 11:21:01 AM

Correct. Unless otherwise noted the molex to fan adapters will provide 12volts
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!