Power Supply Connectors – How to Connect PC Power Connectors

  Connecting a power supply? Learn how to identify and connect PC power supply connectors with this full picture guide.

  Let’s begin with some good news: All computer power supply connectors have a foolproof design such that they can only be connected in a single direction (so there’s no way to mess up here).

  And while a power supply looks like a big mess of cables to the untrained eye, there’s only a few types of PC power connectors that you’ll need to know when connecting a power supply.

  Since SATA and Molex power connectors do not have clips, be sure to insert them firmly so that they won’t come loose or get disconnected.

  1. (20 + 4 Pin) ATX Power Connector

  Also known as main power connector

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  Connects to: ATX motherboard power connectors (see image below)

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  2. (4 + 4 Pin) ATX 12V Power Connector

  Also known as CPU power connector, P4 power connector

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  Connects to: ATX 12V power connectors on motherboards (see image below)

  Note: For most computers, you will just need to connect a single 4 pin connector.

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  3. SATA Power Connector

  Also known as SATA power cable, Serial-ATA power cable

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  Connects to: power connectors on SATA hard drives and SATA optical drives

  Note: Always make sure that your SATA power connectors are fully inserted. Since it doesn’t have a clip, this PC power connector tends to loosen and detach itself.

  4. (4 Pin) Molex Connector

  Also known as peripheral connector

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  Connects to: power connectors of IDE hard drives and IDE optical drives


  IDE drives are going the way of dinosaurs but Molex connectors are

  still well and alive… thanks to the following adapters that allow them

  to power SATA drives and computer case fans:

  Molex to SATA Power Adapter

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  Connects to: power connectors of SATA hard drives and SATA optical drives

  Molex to 3 Pin Fan Adapter

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  Connects to: power connectors of computer case fans

  5. (6 Pin) PCI Express Connector

  Also known as PCI Express power cable, PCI-E connector, PCIe connector

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  Connects to: power connectors of PCI Express graphics cards (see image below)

  Note: Whether a graphics card requires this power supply connector will depend on its power consumption. Low end graphics cards may not need it at all, while high end graphics card (such as the one pictured below) may require up to two such connectors to run. There are also 8 pin (6 + 2) PCI Express connectors that deliver more power than the regular 6 pin connectors.

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  6. (4 Pin) Floppy Drive Connector

  Also known as FDD connector

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  Connects to: power connectors of floppy disk drives

  Note: This connector has been obsolete for ages, but we are including it in this PC power connectors guide because you can still (strangely) find it on modern power supply units.

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