How to Connect Molex Fan Cables

Written by jason spidle Google
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Installing additional or more powerful fans in your computer can greatly reduce the running temperature of your system at an extremely low cost. There are basically two fan-cable connector types to choose from: 3-pin Molex fans that connect directly to the motherboard and 4-pin Molex fans that connect directly to the power source. There are a limited number of 3-pin Molex fan connections on the motherboard so most users will find that 4-pin Molex fans are preferable as computer power sources usually include more 4-pin Molex connections than can ever be used.

Skill level:
Easy

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Instructions

    Connecting a 3-pin Molex Fan

  1. 1

    Install the fan into your computer case in an open fan slot, attaching it firmly with the provided screws.

  2. 2

    Locate a 3-pin Molex connection on your motherboard. There should be three thin pins spaced within a few centimetres of each other. Your case will likely have a motherboard map on the inside that identifies exactly where all the 3-pin Molex connections are and you can consult that if you are having difficulty finding the correct position.

  3. 3

    Align the 3-pin Molex cable with the pins so that the tabs on the cable casing are facing upward and then gently push the cable into the pins.

    Connecting a 4-pin Molex fan

  1. 1

    Install the fan into your computer case in an open fan slot, attaching it firmly with the provided screws.

  2. 2

    Find an unused female Molex connector attached to the power source. The casing will be white and there should be 4-pins available on the connection.

  3. 3

    Connect the male Molex fan cable to the female Molex connector attached to the power source.

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