ATX, WTX and other standard and proprietary power supply (PSU) cables connectors pinouts  > DELL pinouts
This non-standard ATX wiring is used in Dell Pentium II and Pentium III systems.
wire side view:
Color Signal Pin Pin Signal Color
Gray      /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
20 pin MiniFit Jr 5557-20 female (MOLEX 39-01-2200) connector layout
20 pin MiniFit Jr 5557-20 female (MOLEX 39-01-2200) connector
at the cable
According to 45 reports in our database (42 positive and 2 negative) this pinout should be correct.

Is this pinout
DELL ATX motherboard Power Supply visual pinout:
DELL ATX motherboard Power Supply diagram
click to enlarge
Source(s) of this and additional information: DELL ATX design,
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