1. Joined : Feb 2015
    Posts : 17
       26 Feb 2015 #1

    case fan connectors

    ASROCK Extreme 4 mobo i7-3770K 16 GB RAM
    My final build and almost done.

    The case has a 120mm fan that has both a 4-Pin molex connector and a 3-Pin chassis fan connector

    I'm thinking I only need to plug one in. The 4-pin connector will be continuous fan or the 3-pin connector will be intermittent fan controlled by mobo.

    Is that right or would the 3-pin connector just be a thermostat if I plug them both in?
      My System SpecsSystem Spec

  2. Joined : Oct 2013
    North West Indianapolis, Indiana
    Posts : 446
    Windows 7 Ultimate 64 Bit and VM
       26 Feb 2015 #2

    If the fan has a 4 pin Molex and a 3 pin plug then the molex plugs into a power supply plug and the 3 pin plug feeds rotation info to the motherboard. You may need to replace the fan with a 4 pin connector like this
    Cooler Master: PWM Fan 120mm
      My System SpecsSystem Spec


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