PC Power Supply P1 Connector Pinout

Wiring Color Code

  yellow = +12v
  red    = +5v
  orange = +3.3v
  brown  = +3.3v "sense"
  black  = ground
  green  = power on (+5v or ground, powered from +5v standby)
  gray   = power good (+5v or ground)
  white  = -5v
  blue   = -12v

ATX Power Supply

SFX Power Supply

Drive Power Connectors

The standard D-shaped connector is sometimes referred to as a "Molex" connector. The pinout of the smaller-style connector is the same.