(SOLVED) Will I be able to control these fans?

Discussion in 'Desktop Computers' started by pc_fanatic, Jul 17, 2019.

  1. pc_fanatic

    pc_fanatic Member

    Messages:
    207
    New build (yay!), but there was a little hiccup. My Fractal design case has two 3 pin fans in the front, while my mobo has a single 4 pim connector. I am going to get a splitter so I can run both fans off of that one header, but I want to be sure that I will be able to control their speed. My understanding is that since they are 3 pin they can be controlled via voltage, but I’m not positive if my mobo will support such.

    It’s an ASRock H310-CM DVS :

    https://www.newegg.com/p/N82E16813157860

    Thanks.
     
  2. OmniDyne

    OmniDyne Active Member

    Messages:
    545
    I'm not sure if running a splitter from the motherboard header is a good idea to begin with. I've never done it, but I'd be weary of what the header can push. Have you ever done this before?
     
  3. Jiniix

    Jiniix Well-Known Member

    Messages:
    1,358
    Should be just fine, but you shouldn't use more than two fans per 3-pin generally.
    A 3-pin fan header is 12V and usually around 1A (±0.2A), but this specific motherboard has a 2A since it's a combo for a waterpump, and the biggest Fractal fans including RGB will use 0.4A.
    As for controlling the speeds, it's usually just a setting of Silent, Normal and Performance and then hoping the board is doing a fine job.
     
  4. pc_fanatic

    pc_fanatic Member

    Messages:
    207
    I did some more research and this is actually fine to do. Case fans use 0.2 - 0.3 amps so you can use several on a 1 amp header. My board's header turns out to be 2 amps, so yeah plenty.

    Thanks for info.
     
    Last edited by a moderator: Jul 23, 2019
  5. pc_fanatic

    pc_fanatic Member

    Messages:
    207
    Update : My motherboard allows control of these fans through a special DC control mode. I just set the fan settings the same way you would with PWM, but of course its somewhat less accurate. Still I can have them off, silent, medium, full etc, so all good :)
     

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