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24 pin MOLEX 44206-0007 connector layout
24 pin MOLEX 44206-0007 connector
at the motherboard
24 pin MOLEX 39-01-2240 or equivalent connector layout
24 pin MOLEX 39-01-2240 or equivalent connector
at the PSU cable
ATX 2.2 and later (ATX12V 2) is common ATX standard, 24 pin connector.

Changes to ATX standard were made to support 75 watt PCI Express requirements. Most power is now provided on 12 V rails and the power on 3.3 V and 5 V rails was significantly reduced. The standard specifies that two independent 12 V rails (12 V2 for the 4 pin connector and 12 V1 for everything else) with independent overcurrent protection are needed to meet the power requirements.

New ATX v 2.2 uses new connector, but most motherboards nowdays allow to use an old ATX v 1.x power supply with ATX 20 pin connector - it connects to 24 pin motherboard receptacle.

Pin Name   Color Description
1 3.3V   Orange +3.3 VDC
2 3.3V   Orange +3.3 VDC
3 COM   Black Ground
4 5V   Red +5 VDC
5 COM   Black Ground
6 5V   Red +5 VDC
7 COM   Black Ground
8 PWR_OK   Gray Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok)
9 5VSB   Purple +5 VDC Standby Voltage (max 10mA, max 2A in ATX 2.2 spec)
10 12V   Yellow +12 VDC
11 12V   Yellow +12 VDC
12 3.3V   Orange +3.3 VDC
13 3.3V   Orange +3.3 VDC. ATX V2.3 / EPS12V V2.92 both define that the PSU has to use remote sensing to compensate cable drops on the 3.3V line. Because of this there is an additional brown cable crimped together with the orange cable either to pin 13 (ATX) or pin 1 (EPS12V).
14 -12V   Blue -12 VDC
15 COM   Black Ground
16 /PS_ON   Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
17 COM   Black Ground
18 COM   Black Ground
19 COM   Black Ground
20 -5V   White -5 VDC  (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units)
21 +5V   Red +5 VDC
22 +5V   Red +5 VDC
23 +5V   Red +5 VDC
24 COM   Black Ground
 /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.
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PinoutsGuide.com > ATX, WTX and other standard and proprietary power supply (PSU) cables connectors > Pinout of ATX (ATX12V) 24 pin power supply connector and layout of 24 pin MOLEX 44206-0007 connector and 24 pin MOLEX 39-01-2240 or equivalent connector
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