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Pinout for the Standard ATX 24-pin 12V Motherboard Power Connector
The ATX 24-pin power supply connector is the standard motherboard power connector in computers today. The connector itself is a Molex 39-01-2240 connector, often called a Molex Mini-fit Jr.
Below is the complete pinout table for the standard ATX 24-pin 12V power supply connector as of Version 2.2 of the ATX Specification (PDF).
Testing power supply voltages? They must be within ATX specified tolerances.
The pinouts for the 15-pin SATA Power Connector, 4-pin Peripheral Power Connector, 4-pin Floppy Drive Power Connector, and other ATX power supply connectors can be seen in our ATX Power Supply Pinout Tables list.
The power supply connector can only be plugged in while pointing a specific direction on the motherboard. If you look carefully at the following illustration, you can see the pins take a unique shape, one the motherboard matches in only one direction.
The original ATX standard supported a 20-pin connector with a very similar pinout as the 24-pin connector but with pins 11, 12, 23, and 24 omitted. This means the newer 24-pin power supply is useful for motherboards that require more power, and therefore eliminates the need for ATX 12V power supplies to provide an auxiliary power cable (although some still may).
The additional four pins are usually detachable (see the lower part of the image above), allowing it to be used on a 20-pin motherboard connection. The extra pins simply hang over the motherboard connector—they don't plug into another slot. Some motherboards allow the reverse: to use the older 20-pin power supply cable on a 24-pin motherboard connection.
If you need to use a 24-pin power supply connector on a motherboard that only accepts a 20-pin cable, there are a number of online retailers where you can purchase a 24-pin to 20-pin adapter, like this StarTech adapter from Amazon. Although the motherboard appears to accept all 24 pins using this type of adapter, it still means the additional four pins go unused.
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