ATX Power Supplies Pinout

ATX Power Supplies Pinout

ATX design comes with an additional voltage line which is a step up from the former ATX 2.0. This is +3.3V connector that is connected so the software that can power the machine on and off. One of the features involved is the ATX power supplies pin-out configuration which can found within the PSU – Power Supply Unit.

PSU’s are the heart of the power system giving the machine the ability to supply power to the hardware components via multiple connections either straight to the device itself or onto the motherboard where power is further distributed. The specs for these PSU’s are generally dictated by Intel implemented on PC platforms and the Intel design guidelines are regularly updated. Intel’s instruction releases can be found all over the internet and one of the mechanisms mentioned is the ATX power supplies pin-out configuration.

ATX Power Supply Set-Up

Typical ATX power supplies have multiple connectors with various sizes depending on the PC component it will be connecting to. These come out from inside the PSU and into the PC casing and are long enough to spread around the casing to reach the hardware they need to power. To fully understand ATX power supply pin-out the basics need to be explained.

Larger cables are fitted directly onto the CD-ROMs, hard drives, amongst other components that require power.

Smaller cables with smaller pin connectors power the other PC peripherals which are generally the smaller PC components that require power.

ATX power supplies pin-out configurations

Times have changed and the as technology advances so have the pin-out configurations. Nowadays the ATX 24 pin has outpaced the 20 pin and is now found in all modern PC’s as the only PSU connector. This just one example of the many pin-out connections required to run a PC.

  • The newer ATX v2.2 24 pin-out mother board connector powers the system board giving the machine a core base. This now features in all new machines and will be the standard for a while come.
  • SATA technology has now been introduced and provides some of the most advanced desktop PC hard drive read/write speeds introducing 15 pin SATA pin-out connections. This connects to optical drives and has now become yet another standard appearing in the latest PC models.
  • The peripheral 4 pin pin-out that deliver power from the main PSU into video cards and other small devices.
  • Some people still use the floppy disk drive believe it or not. The pin-out is one of the smallest wire heads and has only 4 pins.
  • On all motherboards the CPU needs regulated power. There are 2 types of pin-outs used to achieve this. The first is the 4 pin and is the most common and the second is the 6 pin both providing +12 VDC directed at the processor.

Building your PC or replacing existing parts

For the PC builders out there or for those who are just interested. It is advisable to check the ATX power supplies pin-out connections required. Make sure the components you buy, especially second hand or for older systems, match the ATX power supplies pin-out PSU connections or you may not be able to use them. Some hardware will come with dual power sockets allowing a generic fit, but it is always better to check what you have and you need before parting with your money.