Everything You Need to Know About Power Supplies

Older Power Plugs

The two plugs described below aren’t used anymore, but you may find them while disassembling old PCs.

  • Motherboard six-pin auxiliary power connector: This connector was released together with ATX12V 1.x specification, but only a few motherboards (most notably socket 423 and early socket 478 boards) used it.

Six-pin motherboard auxiliary connectorFigure 21: Six-pin auxiliary power connector.

  • Motherboard 12-pin connector: This connector was the main motherboard connector on AT motherboards and AT power supplies. It became obsolete with the introduction of the ATX standard. It used two six-pin connectors and the problem was that these two six-pin connectors could be inserted on any side of the 12-pin connector found on the motherboard. In order to avoid mistakes you must install these connectors in a way that the black wires are placed on the center of the connector (see Figure 22).

AT Power ConnectorFigure 22: AT power connector.

Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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