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An AT power supply delivers +5 V, +12 V, -5 V and -12 V voltages using two six-pin connectors. A few newer boards used an aditional connector for +3.3 V. Note, that you must install these connectors to the motherboard in a way that the black wires are placed on the center, or your equipment will be damaged.
Pinouts for ATX-compliant computer power supply: 20 and 24-pin main connectors, 12V, SATA, PCI, floppy drive and other. Provides diagrams, wire colors and part numbers.
Detailed Pinout Guide for ATX Power. In this section, we will delve into the intricacies of the connections and configurations for the main connectors found in modern computer units.
ATX power supply pinout tables are useful references when testing a power supply. You need to know which pins correspond to ground or specific voltages before you can successfully test a PSU. Each pinout table linked below (in the headings of each section) conforms to Version 2.2 of the ATX Specification (PDF).
Below is a quick overview of its pinout. These voltage rails are used to supply power to a range of electronic components within the SATA devices. Coming to the voltage rails, the 3.3V and 5V ones are generally used to power low-power components like a SSD memory module and HDD controller.
Specification, such as information about the physical form factor of the power supply, cooling requirements, connector configuration, and pertinent electrical and signal timing specifications.
ATX specification includes not only Power Supply Unit, but also interface to case and motherboard. In addition to the old AT standard, ATX 2.0 has one extra voltage line available (+3.3V), a connector chain-lined to the single 20-pin and a power-on wire that allows Software to turn off the PSU.