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RPM Readings with a fan splitter?

Discussion in 'Overclocking & Cooling' started by Guitarman0, 6 Jun 2010.

  1. Guitarman0

    Wise Guy

    Joined: 4 Dec 2009

    Posts: 1,669

    Location: Worcestershire

    Has anyone tried connecting 2 3pin fans to a fan controller that provides an RPM readout via a 3pin fan splitter? Do you get an RPM readout from one of the fans or do you just get no reading at all?

  2. Akempster


    Joined: 16 Dec 2009

    Posts: 330

    Location: Birmingham

    id believe you would get one of the following dependant on its design:

    1.Average readout - unlikely
    2. reads one but not the other
    3. Makes an estimate based on voltage so it makes no difference

    i doubt that it would give no reading at all, all i can say is to give it a go if not just put the least noisy fan on a molex connection on full power.
  3. UnworthyBean

    Wise Guy

    Joined: 15 Jun 2009

    Posts: 2,474

    Normally 3 pin fan splitters will only have the yellow wire (RPM readings) going to one fan, So you'll only be getting one RPM reading.
  4. Tealc


    Joined: 13 Jul 2009

    Posts: 7,037

    Location: Llanelli

    You can add another sensor wire to the empty connector and connect it to an empty header on the motherboard if you want to see what RPM that fan is doing. That's what I did as I wanted to make sure that both Noctua fans didn't create additional noise by being spun at widly different speeds.