These are the GND (Ground) pins, completing the circuit for the 12V rails.

If you need help identifying the for your specific revision or want a wiring diagram for a 12V conversion, let me know!

🚀 Since 18 amps is a high current load, do not rely on a single +12V wire. Solder all three +12V wires together and all three Ground wires together to distribute the load and prevent the wires from overheating.

This pin is typically used for "Power Good" signaling or sensing by the Dell motherboard. In most DIY scenarios, it remains unused. Technical Specifications

The D220P-01 is a fan-cooled unit. Ensure the intake and exhaust vents are not obstructed when mounting it in a custom enclosure or under a desk.

This is the control pin. To turn the power supply on, this pin must be shorted to Ground (GND).

The Dell D220P-01 is a highly sought-after external power brick, originally designed for the Dell OptiPlex SX280 and GX620 ultra-small form factor PCs. Because it delivers a substantial 220 watts of power at 12V, it has become a staple for hobbyists looking to power radio equipment, LED strips, or DIY electronics.

To identify the pins, orient the plug so the locking clip or guide notch is facing upward. We will number them 1 through 4 on the top row (left to right) and 5 through 8 on the bottom row (left to right).