24 pin power connector at the power supply cable
20+4 pin power connector at the power supply cable
24 pin MOLEX 44206-0007 connector at the motherboard
ATX and BTX power connector on the motherboard consists of two rows of 12 pins. This connector from the ATX/BTX power supply can only be fitted in one way.
This ATX ver. 2.x standard supports 75 watt PCI Express requirements. Some motherboards allow to use an old ATX Motherboard Power - 20 Pin (ver. 1.x) with 20 pin connector that fits into 24 pin female connector. If you have an ATX power supply with a 24 pin main cable, it’s okay to plug it into a motherboard with a 20 pin connector.
| Color | Pin | Name | Description | Color | Pin | Name | Description |
|---|---|---|---|---|---|---|---|
| orange | 1 | +3.3 VDC | Power +3.3V | orange | 13 | +3.3 VDC | Power +3.3V |
| orange | 2 | +3.3 VDC | Power +3.3V | blue | 14 | -12 VDC | Power -12V |
| black | 3 | GND | Ground | black | 15 | GND | Ground |
| red | 4 | +5 VDC | Power +5V | green | 16 | PS-ON | Remote Power ON/OFF |
| black | 5 | GND | Ground | black | 17 | GND | Ground |
| red | 6 | +5 VDC | Power +5V | black | 18 | GND | Ground |
| black | 7 | GND | Ground | black | 19 | GND | Ground |
| grey | 8 | PWROK | Power Good | 20 | |||
| purple | 9 | +5 VSB | +5V Standby | red | 21 | +5 VDC | Power +5V |
| yellow | 10 | +12 VDC | Power +12V | red | 22 | +5 VDC | Power +5V |
| yellow | 11 | +12 VDC | Power +12V | red | 23 | +5 VDC | Power +5V |
| orange | 12 | +3.3 VDC | Power +3.3V | black | 24 | GND | Ground |
Notes
- /PSON activated by pressing and releasing the power button while the power supply is in standby mode.
- Activating /PSON connects the power supply’s /PSON input to ground, thereby switching the power supply to full-on condition.
- 18 AWG is recommended for all wires except pin 11, which should be 22 AWG.
- For 300W configurations 16 AWG is recommended.
Connector part numbers
- Motherboard connector: Molex 39-28-1243
- Cable connector: Molex 39-01-2240
- Terminals: Molex 39-00-0168, Molex 44476-1111
- Maximum current per circuit: 6 amps
References
- ATX Specification, Version 2.2 (Intel) — Internet Archive
- Intel ATX12V Power Supply Design Guide, Version 2.2 — Intel Corporation.
- Balanced Technology Extended (BTX) Interface Specification v1.0b (Intel)