PC Power connectors

The images below illustrate the most common power connectors used in modern PC's. These images show the connectors as viewed from the wire side of the plug. The colours shown in the images correspond to the wire colours found in the plugs, and the legend below each image shows the normal operating voltage or the system function of each wire.
Clicking on an image will display a pop-up window with a larger sized version of that image.

ATX Power Supply Connector

Description	Name	Color	Pin	Pin	Color	Name	Description
Power +3.3V	+3.3V	Brown	1	11	Brown	+3.3V	Power +3.3V
Power +3.3V	+3.3V	Brown	2	12	Blue	-12V	Power -12V
Ground	GND	Black	3	13	Black	GND	Ground
Power +5V	+5V	Red	4	14	Gray	PS-ON	Power Supply Remote On/Off Control
Ground	GND	Black	5	15	Black	GND	Ground
Power +5V	+5V	Red	6	16	Black	GND	Ground
Ground	GND	Black	7	17	Black	GND	Ground
Power Good	PWRGD	Orange	8	18	White	+5V	Power +5V
+5V VSB	+5V VSB	Violet	9	19	Red	+5V	Power +5V
Power +12V	+12V	Yellow	10	20	Red	+5V	Power +5V

XT/AT Power Supply Connector

Pin	Color	Name	Description
1	Red	+5V	Power +5V
2	Red	+5V	Power +5V
3	Red	+5V	Power +5V
4	White	-5V	Power -5V
5	Black	GND	Ground
6	Black	GND	Ground

7	Black	GND	Ground
8	Black	GND	Ground
9	Blue	-12V	Power -12V
10	Yellow	+12V	Power +12V
11	Red	+5V	Power +5V
12	Orange	PWRGD	Power Good

5¼ Power Supply Connector (Molex)

Used for Hard-disks, CD-ROMs and most other storage devices on desktop computers.

Pin	Color	Name	Description
1	Yellow	+12V	Power +12V
2	Black	GND	Ground
3	Black	GND	Ground
4	Red	+5V	Power +5V

3½ Power Supply Connector

Used for 3½ Floppy drives on desktop computers.

Pin	Color	Name	Description
1	Red	+5V	Power +5V
2	Black	GND	Ground
3	Black	GND	Ground
4	Yellow	+12V	Power +12V

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