How to Connect Molex Fan Cables

Written by jason spidle | 13/05/2017

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.

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

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.

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.

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

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.

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

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