For the operation basics of smps psu see our power supply tutorial.
Atx power supply connectors.
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.
An atx power supply provides a number of peripheral power connectors and in modern systems two connectors for the motherboard.
20 pin molex 39 01 2200 at the cable.
Braided atx sleeved cable extension kit for power supply cable kit psu connectors 24 pin 8 pin 6 pin 4 4 pin 6 pack with cable comb 24 pieces set 24 pin 8 pin 6 pin red.
20 pin molex 39 29 9202 at the motherboard.
The connector itself is a molex 39 01 2240 connector often called a molex mini fit jr.
The atx 24 pin power supply connector is the standard motherboard power connector in computers today.
An 8 pin or 4 4 pin auxiliary connector providing additional power to the cpu and a main 24 pin power supply connector an extension of the original 20 pin version.
Atx 24 pin 12v power connector pinout atx v2 2.