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Case fan has 2 connectors mobo only has 3 pin connector

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  • Fan
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Last response: in Components
February 7, 2013 1:31:01 AM

am I able to use this fan? also, how would i install it if i could.

More about : case fan connectors mobo pin connector

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February 7, 2013 2:46:01 AM

If you are referring to the fan having a 2-pin connector, and the board having a 3-pin connector, we need to know if you mean a 2-pin Molex. If so, you can either use an adapter to plug into the MB header or plug the fan directly into any Molex from the PSU. If you mean a connector that matches the MB header, but only has 2 pins, just plug it in using the guide and it will use just the two MB pins necessary.
February 7, 2013 3:00:01 AM

It matches the mobo header..but a question, would the guide for this be in the mobo manual?
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February 7, 2013 3:01:36 AM

If you read the instruction manual that came with the case, depending on the case, it should explain how to connect these.

The two pins should only use two of the 3 pins, the 3rd is for monitoring. There should only be one way to connect these, line the plastic slits up.
February 7, 2013 3:04:53 AM

When I said 'guide' I was actually referring to the 'key' on the connector. Sorry about the confusion. If you have a 2 wire fan cable with a MB header-type connector, it will fit the 3-pin MB header by just using 2 of the pins; the +12V and ground. The 3rd pin is for tach feedback, which you won't have with a 2 wire fan. So your fan will always run at 100%.
February 7, 2013 3:10:42 AM

Thanks, I got it, but it actually was in my motherboard manual and not on the mobo itself (the ground vs 12v indicators) but its working now thanks. And these fans are cheap anyways its ok for it to run at 100% :p 
February 7, 2013 3:10:51 AM

Best answer selected by frigger908.