DELL ATX Motherboard Power Supply Connector Pinout - AllPinouts

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This non-standard ATX wiring is used in Dell Pentium II and Pentium III systems. The connector on the power supplies used in Dell Socket 478 Pentium 4 systems is standard ATX-12V.

Connector atx20f.png
20 pin MOLEX 39-29-9202 connector at the motherboard.

Connector atx20m.png
20 pin MOLEX 39-01-2200 connector at the cable.

Color Signal Pin Pin Signal Color
grey /PS_On 11 1 +5V red
black GND 12 2 GND black
black GND 13 3 +5V red
black GND 14 4 GND black
white -5V 15 5 Power_Good orange
red +5V 16 6 +5VSB (standby) purple
red +5V 17 7 +12V yellow
red +5V 18 8 -12V blue
KEY (blank) - 19 9 GND black
red +5V 20 10 GND black


  • 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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