| Rail | Voltage Tolerance | Max Current | Notes | |------|------------------|-------------|-------| | +5VSB | ±5% (4.75–5.25V) | 2A | Standby rail. Good for powering microcontrollers or small LEDs. | | +3.3V | ±5% (3.14–3.47V) | 10A | Shared with +5V regulation (mag-amp design). | | +5V | ±5% | 14A | Main rail for older drives and logic. | | +12V | ±10% (10.8–13.2V) | (peak 15A) | The weakest point – not suitable for modern GPUs. | | -12V | ±10% | 0.3A | For RS-232 serial ports. | | PW-OK | High = 3–5V | – | Gray wire on secondary connector goes high 200ms after PS_ON# low. |
Dell D220P-01 (DA-2 series) power supply uses a proprietary 8-pin connector to deliver 220W (or 216W) at 12V and 18A. This power supply is commonly used for Dell Optiplex Ultra Small Form Factor (USFF) desktops and is a popular choice for powering DIY external graphics card (eGPU) setups due to its high amperage. Pinout Configuration Dell D220p 01 Power Supply Pinout 2
Whether you are reviving a vintage Optiplex, building a low-cost bench supply, or learning ATX power supply basics, this guide should serve as your definitive reference. Always observe safety: capacitor discharge, insulation, and proper fusing. | Rail | Voltage Tolerance | Max Current
To use this PSU outside a Dell motherboard: | | +5V | ±5% | 14A | Main rail for older drives and logic