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Pin-Out

  • ATX12V v2.x Motherboard Power Connector
Pin Color Output
1 Orange +3.3V
2 Orange +3.3V
3 Black Ground
4 Red +5V
5 Black Ground
6 Red +5V
7 Black Ground
8 Gray Power Good
9 Purple +5VSB
10 Yellow +12V
11 Yellow +12V
12 Orange +3.3V
13 Orange +3.3V
14 Blue -12V
15 Black Ground
16 Green Power On
17 Black Ground
18 Black Ground
19 Black Ground
20 White -5V
21 Red +5V
22 Red +5V
23 Red +5V
24 Black Ground
  • EPS12V Connector
Pin Color Output
1 Black Ground
2 Black Ground
3 Black Ground
4 Black Ground
5 Yellow +12V
6 Yellow +12V
7 Yellow +12V
8 Yellow +12V
  • ATX12V Connector
Pin Color Output
1 Black Ground
2 Black Ground
3 Yellow +12V
4 Yellow +12V
  • PCI Express 6-Pin Auxiliary Connector (PEG)
Pin Color Output
1 Yellow +12V
2 * *
3 Yellow +12V
4 Black Ground
5 Black Ground
6 Sense0†

* The PCI Express specification says this pin must be left unconnected. However, the EPS12V specification says this pin must be used for +12 V (yellow wire).

† The Sense0 pin generates a code for the video card to know which kind of power connector is available. When this pin is grounded (black wire) and the Sense1 pin is not available (which is the case), this indicates that the auxiliary power connector is a six-pin one. Therefore, six-pin connectors have this pin grounded.

  • PCI Express 8-Pin Auxiliary Connector (PEG)
Pin Color Output
1 Yellow +12V
2 Yellow +12V
3 Yellow +12V
4 Sense1†
5 Black Ground
6 Black Ground
7 Black Ground
8 Sense0†

† The Sense0 and Sense1 pins form a code that tells the video card which kind of power connector is available. When both are grounded (black wire), this tells the video card that an eight-pin connector is used. This is the reason why on eight-pin connector pins four and six are grounded.

  • Serial ATA Power Connector
Pin Color Output
1 Orange +3.3V
2 Orange +3.3V
3 Orange +3.3V
4 Black Ground
5 Black Ground
6 Black Ground
7 Red +5V
8 Red +5V
9 Red +5V
10 Black Ground
11 Black Ground
12 Black Ground
13 Yellow +12V
14 Yellow +12V
15 Yellow +12V
  • Peripheral Power Connector
Pin Color Output
1 Yellow +12V
2 Black Ground
3 Black Ground
4 Red +5V
  • Floppy Disk Drive Power Connector
Pin Color Output
1 Red +5V
2 Black Ground
3 Black Ground
4 Yellow +12V
  • ATX12V v1.x/ATX Motherboard Power Connector
Pin Color Output
1 Orange +3.3V
2 Orange +3.3V
3 Black Ground
4 Red +5V
5 Black Ground
6 Red +5V
7 Black Ground
8 Gray Power Good
9 Purple +5VSB
10 Yellow +12V
11 Orange +3.3V
12 Blue -12V
13 Black Ground
14 Green Power On
15 Black Ground
16 Black Ground
17 Black Ground
18 White -5V
19 Red +5V
20 Red +5V
  • ATX12V v1.x Auxiliary Connector
Pin Color Output
1 Black Ground
2 Black Ground
3 Black Ground
4 Orange +3.3V
5 Orange +3.3V
6 Red +5V
  • AT Power Connector
Pin Color Output
1 Orange Power Good
2 Red +5V
3 Yellow +12V
4 Blue -12V
5 Black Ground
6 Black Ground
7 Black Ground
8 Black Ground
9 White -5V
10 Red +5V
11 Red +5V
12 Red +5V
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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.