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PSU, Fans, and mobo connection question

  • Power Supplies
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  • Components
Last response: in Components
January 18, 2011 12:10:40 PM

Hello all, put together my first build recently and had run into an issue where I shorted my chassis fans out accidentally. I did a few searches online on fan connections and didn't find much unfortunately, so I figured I'd pose my questions here to see if maybe someone could enlighten me a bit.

First a little background, I have a Lian Li K62 case. It has 4 fans (one front, one back, and 2 top) that are all 12 volt. I hooked them up in series on one cable coming from my Corsair 650 watt psu, and connected the end (a 4 pin adapter) to my mobo at another 4 pin adapter.

My mistake was obviously not checking the voltages. The 4 pin adapter was 5 volt and one of the pins wasn't necessary for my need, thus shorting it out.

Anyway, my questions (if anyone can provide help) are as follows:
Is there any issue having all 4 of these fans on one line from the PSU?

I shorted out the end of the line and it smoked up a bit melting that wire. I can disconnect that portion and run the fans without being connected to the mobo. Is this an okay set-up for now (being my first set-up, I will fix this as I want to do it right, but in the meantime I want to know if it's dangerous or not)?

I believe the proper fix to this was to connect my fans to the 3 pin 12 volt Chassis fan connector on the mobo (once I get the wire fixed), is that correct?

Thanks for any info you might be able to provide.

More about : psu fans mobo connection question

a c 144 ) Power supply
January 18, 2011 12:35:33 PM

No. Your mistake was connecting the fans to both the motherboard and the PSU.

Fans do not use much power. There is no problem connecting all 4 fans to the PSU. There is, however, a problem connecting all 4 fans to one motherboard connector. You can overload the little chip or transistor that controls the fan. I do not recomment conecting more than 2 fan to one motherboard connector.
January 18, 2011 2:31:30 PM

Hmm, okay, so then just to clarify, I need only to connect the fans to the PSU OR the mobo?

The fans have a larger 4 hole connector, the only way I was able to connect them in series was to connect each fan to the PSU in series on the cable. At the end of the cable was a smaller 4 pinhole connector which is how I connected it to the mobo.

How would I connect the fans directly to the motherboard without the cable from the PSU? Is there a standalone connection that goes directly there that I simply don't have/wasn't included?