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Fan cable 3 pin- 4 pin adapter

So I accidentally bought the wrong fans, one of them is a 4 pin plug that looks like this

http://cdn.overclock.net/9/94/94c41971_4pin_connector_002.jpeg


And all my other fans are 3 pins that look like this---

http://cdn.overclock.net/6/60/60342fc3_vbattach127330.jpeg


Anyone know where I can get a 3 to 4 pin adapter??? I can't find one and I have looked all over.
6 answers Last reply Best Answer
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  1. If I understand correctly, you have 3 pin fans you want to act as four pin types and want to know about about a possible adapter for that. It doesn't exist but I will link you to this thread from Overclockers that shows the schematics for making your own
    http://www.overclockers.com/forums/showthread.php?t=683678
    Or, you could get a fan controller (rheostat) and use that to control your fan speeds. I think that's probably the easiest route.
  2. And if its the other way around, then you don't need an adapter.
    You can connect a 4 pin fan in a 3 pin motherboard fan header.

    http://www.intel.com/support/motherboards/desktop/sb/cs-012074.htm

    http://www.allpinouts.org/index.php/Motherboard_%28CPU%29_4_Pin_Fan
  3. Best answer
    The fan header connectors are backwards/forwards compatible with each other, thats why they have guide grooves to fit the guide tab on the mobo fan connector, the only difference with the 4-pin connectors is they support PWM speed management.
  4. My problem was that I needed to connect a 4 pin fan to a 3 pin source. I realized that a 4-pin is just a 3 pin with an optional wire to use, so I picked up http://www.newegg.com/Product/Product.aspx?Item=N82E16812189119

    this made it so the 3 pin would fit in a 4 pin
  5. Best answer selected by gorlios.
  6. An old thread, but I think for anyone else still having this problem (including me) then the best solution is to buy one of these: -

    http://www.amazon.com/4Pin-3Pin-Standard-Adapter-Cable/dp/B015NM4HOE/ref=sr_1_5?s=pc&ie=UTF8&qid=1453304817&sr=1-5&keywords=3+to+4+pin+fan+adapter

    Or

    http://www.amazon.co.uk/kenable-Female-Socket-Power-Extension/dp/B009X5VKI4/ref=sr_1_1?s=electronics&ie=UTF8&qid=1453306429&sr=1-1&keywords=kenable+3+Pin+Fan+Male+Plug+to+Female+Socket+Power+Extension+Cable+30cm

    If you have 4 pin fans you want to install and have (for example) the Coolermaster Cosmos II case with a fan controller and only the 3 pin power cables from the controller, then these adapters are very useful.
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