Template:ATX power connector

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24-pin ATX12V 2.x power supply connector
Color Signal[lower-alpha 1] Pin Pin[lower-alpha 2] Signal[lower-alpha 1] Color
Orange +3.3 V 1 13 +3.3 V Orange
+3.3 V sense[lower-alpha 3] Brown
Orange +3.3 V 2 14 −12 V Blue
Black Ground 3 15 Ground Black
Red +5 V 4 16 Power on[lower-alpha 4] Green
Black Ground 5 17 Ground Black
Red +5 V 6 18 Ground Black
Black Ground 7 19 Ground Black
Grey Power good[lower-alpha 5] 8 20 Reserved[lower-alpha 6] None
Purple +5 V standby 9 21 +5 V Red
Yellow +12 V 10 22 +5 V Red
Yellow +12 V 11[lower-alpha 7] 23[lower-alpha 7] +5 V Red
Orange +3.3 V 12[lower-alpha 7] 24[lower-alpha 7] Ground Black
  1. 1.0 1.1   Control signals.
  2. Pins 13–21 are numbered 11–20 in the 20-pin connector.
  3. Supplies +3.3 V power and also has a second low-current wire for remote sensing.[1]
  4. This is a control signal and is pulled up to +5 V by the PSU, and must be driven low to turn on the PSU.
  5. This is a control signal and is low when other outputs have not yet reached, or are about to leave, correct voltages.
  6. This pin (formerly −5 V, white wire) is absent in current power supplies; it was optional in ATX and ATX12V ver. 1.2, and deleted as of ver. 1.3.
  7. 7.0 7.1 7.2 7.3 These pins are not present in the 20-pin ATX connector.
  1. "ATX Specification Version 2.1" (PDF).