How to convert 3-pin to 4-pin molex

Written by ruri ranbe
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How to convert 3-pin to 4-pin molex
A computer fan helps to keep the hardware installed inside the computer cool. (fan image by dr0p from Fotolia.com)

Computer fans utilise either a 3-pin or a 4-pin Molex cable to connect to the computer. Some fans connect to a 3-pin slot on the motherboard, whereas others connect directly to the power supply.

A 3-pin to 4-pin Molex cable adaptor converts a 4-pin fan cable to 3-pin, allowing it to connect to the motherboard. The adaptor also converts a 3-pin fan cable to a 4-pin power connector, allowing it to connect to the power supply.

Skill level:
Easy

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Things you need

  • Phillips screwdriver
  • 3-pin to 4-pin Molex cable adaptor

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Instructions

  1. 1

    Turn off the computer. Remove the power cable from the rear of the system. Unscrew the case cover.

  2. 2

    Pull the cover away and set it aside. Put on an antistatic wrist strap or touch the chassis to ground yourself.

  3. 3

    Remove the 3-pin to 4-pin Molex cable adaptor from its packaging. Attach the 4-pin connector on the end of the converter to the 4-pin cable coming from the fan.

  4. 4

    Insert the 3-pin connector located on the opposite end of the adaptor into the 3-pin slot located on the motherboard.

  1. 1

    Turn off the computer. Remove the power cable from the rear of the system. Unscrew the case cover.

  2. 2

    Pull the cover off the system and set the cover aside. Put on an antistatic wrist strap or touch the chassis to ground yourself.

  3. 3

    Remove the 3-pin to 4-pin Molex cable adaptor from its packaging. Locate the 3-pin cable attached to the computer fan.

  4. 4

    Insert the 3-pin connector on the adaptor to the fan cable. Connect the other end of the converter to the 4-pin Molex cable attached to the power supply.

Tips and warnings

  • Never touch the hardware stored inside your case without first grounding yourself. Static electricity can permanently damage computer equipment.

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