ATX 24-Pin Motherboard Power Supply
Standard 24-pin dual-row power connector defined in ATX12V 2.0+ specifications providing +3.3V, +5V, +12V, -12V, +5VSB standby power, PS_ON# power switch, and PWR_OK signal.
Aliase:ATX12V, ATX 24-Pin, Main Power Connector, EPS12V 24-Pin
ATX 24-Pin Receptacle (Motherboard Header View)
24 Pins
Pinout Table24
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | +3.3V | Power | +3.3V DC Main Power (Orange) |
| 2 | +3.3V | Power | +3.3V DC Main Power (Orange) |
| 3 | GND | Ground | Ground (Black) |
| 4 | +5V | Power | +5V DC Main Power (Red) |
| 5 | GND | Ground | Ground (Black) |
| 6 | +5V | Power | +5V DC Main Power (Red) |
| 7 | GND | Ground | Ground (Black) |
| 8 | PWR_OK | Digital | Power Good Signal (+5V when voltages stable) (Gray) |
| 9 | +5VSB | Power | +5V Standby Power (Active when PC is off) (Purple) |
| 10 | +12V | Power | +12V DC Main Power (Yellow) |
| 11 | +12V | Power | +12V DC Main Power (Yellow) |
| 12 | +3.3V | Power | +3.3V DC Main Power (Orange) |
| 13 | +3.3V_SENSE | Power | +3.3V Remote Sense / +3.3V DC (Brown/Orange) |
| 14 | -12V | Power | -12V DC Negative Supply (Blue) |
| 15 | GND | Ground | Ground (Black) |
| 16 | PS_ON# | Digital | Power Supply On Control (Active-low pull to GND to turn on) (Green) |
| 17 | GND | Ground | Ground (Black) |
| 18 | GND | Ground | Ground (Black) |
| 19 | GND | Ground | Ground (Black) |
| 20 | NC/-5V | NC | Reserved / Not Connected (formerly -5V in ATX 1.x) (White) |
| 21 | +5V | Power | +5V DC Main Power (Red) |
| 22 | +5V | Power | +5V DC Main Power (Red) |
| 23 | +5V | Power | +5V DC Main Power (Red) |
| 24 | GND | Ground | Ground (Black) |