The colors are shown here just for reference (you won't see them from the front). The colors in this chart represent recommended wire colors in the PSU cables. Accordingly, different ATX-style PSU may use different number of power wires: see the pinout diagram to the right. To provide the additional wattage, the old part has been replaced by a new 24-pin P1. When PCI Express® bus was introduced, PCIe cards needed up to 75W extra. The original ATX systems had 20-pin main connector P1. Standard ATX power supplies typically have the main power connector P1, additional 12V connectors, as well as peripheral, floppy drive, serial ATA, and PCI Express® receptacles, which we will describe below.įor the operation basics of SMPS PSU see our power supply tutorial.
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