To me, an ATX power supply is one of those big boxes delivering 500W+ inside a PC tower, but since it’s not possible to create hardware with much lower power consumption, HDPLEX has designed an ultra-compact 250W passive ATX power supply using the same GaN (Gallium Nitride) technology as found in some tiny USB-C power supplies.

With a 170x50x25mm footprint, the company claims it is the world’s smallest ATX PSU, and it is especially well suited to SFF PC enclosures, but it should also work pretty well in other space-constraints applications with a board equipped with an ATX connector, or through an adapter board, or even some RGB LED projects.

GaN ATX power supply specifications:

• Wattage – 250W (94% Efficiency).
• Input Voltage – 90V-264V 50/60hz
• DC output
  • +3.3V up to 10A
  • +5V up to 10A
  • +12V up to 20A
  • -12V up to 1A
  • +5VSb up to 3A
  • Max combined power for +3.3V and +5V – 80 W
  • Total Power – 250W
• Idle Power – <0.4W/0.1W