This is the main power connector for a ATX mother board, and has 20 poles.
This is supported by the mother board of ATX 12 V pre-version 2.0 (ver.1.3). The way of the pin assignment is as follows.
| Pin. No | Output | Pin. No | Output |
1 | +3.3V | 11 | +3.3V |
2 | +3.3V | 12 | -12V |
3 | COM | 13 | COM |
4 | +5V | 14 | PS_ON# |
5 | COM | 15 | COM |
6 | +5V | 16 | COM |
7 | COM | 17 | COM |
8 | PWR_OK | 18 | -5V or NC |
9 | +5VSB | 19 | +5V |
10 | +12V | 20 | +5V |