Template:ATX power connector
24-pin ATX12V 2.x power supply connector
(20-pin omits the last four: 11, 12, 23 and 24)
| Color |
Signal |
Pin |
Pin |
Signal |
Color
|
| Orange
|
+3.3 V
|
1
|
13
|
+3.3 V
|
Orange
|
| +3.3 V sense
|
Brown
|
| Orange
|
+3.3 V
|
2
|
14
|
−12 V
|
Blue
|
| Black
|
Ground
|
3
|
15
|
Ground
|
Black
|
| Red
|
+5 V
|
4
|
16
|
Power on
|
Green
|
| Black
|
Ground
|
5
|
17
|
Ground
|
Black
|
| Red
|
+5 V
|
6
|
18
|
Ground
|
Black
|
| Black
|
Ground
|
7
|
19
|
Ground
|
Black
|
| Grey
|
Power good
|
8
|
20
|
Reserved
|
N/C
|
| Purple
|
+5 V standby
|
9
|
21
|
+5 V
|
Red
|
| Yellow
|
+12 V
|
10
|
22
|
+5 V
|
Red
|
|
| Yellow
|
+12 V
|
11
|
23
|
+5 V
|
Red
|
| Orange
|
+3.3 V
|
12
|
24
|
Ground
|
Black
|
- Pins 8, 13, and 16 (shaded) are control signals, not power:
- "Power On" is pulled up to +5V by the PSU, and must be driven low to turn on the PSU.
- "Power good" is low when other outputs have not yet reached, or are about to leave, correct voltages.
- The "+3.3 V sense" line is for remote sensing.[1]
- Pin 20 (formerly −5V, white wire) is absent in current power supplies; it was optional in ATX and ATX12V ver. 1.2, and deleted as of ver. 1.3.
- The right-hand pins are numbered 11–20 in the 20-pin version.
|
|
Template:AT power connector
AT power connector (Used on older AT style mainboards)
| Color |
Pin |
Signal
|
|
|
P8.1 |
Power Good
|
|
|
P8.2 |
+5 V
|
|
|
P8.3 |
+12 V
|
|
|
P8.4 |
−12 V
|
|
|
P8.5 |
Ground
|
|
|
P8.6 |
Ground
|
|
|
|
|
P9.1 |
Ground
|
|
|
P9.2 |
Ground
|
|
|
P9.3 |
−5 V
|
|
|
P9.4 |
+5 V
|
|
|
P9.5 |
+5 V
|
|
|
P9.6 |
+5 V
|
|
