ATX12V Power Supply Design Guide
Version 2.0
4.5.1. ATX Main Power Connector
Connector: MOLEX* housing: 24 Pin Molex 
(Mating motherboard connector is Molex
18 AWG is suggested for all wires except for the +3.3 V sense return wire, pin 11 (22 AWG). For 300 W configurations, 16 AWG is recommended for all +12 VDC, +5 VDC, +3.3 VDC, and COM.
Pin | Signal | Color |
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1 | +3.3VDC | Orange |
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2 | +3.3VDC | Orange |
3 | COM | Black |
4 | +5VDC | Red |
5 | COM | Black |
6 | +5VDC | Red |
7 | COM | Black |
8 | PWR_OK | Gray |
9 | +5VSB | Purple |
10 | +12 V1DC | Yellow |
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11 | +12 V1DC | Yellow |
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12 | +3.3 VDC | Orange |
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Pin | Signal | Color |
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13 | +3.3VDC | Orange |
[13] | [+3.3 V default | [Brown] |
| sense] |
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14 | Blue | |
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15 | COM | Black |
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16 | PS_ON# | Green |
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17 | COM | Black |
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18 | COM | Black |
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19 | COM | Black |
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20 | Reserved | N/C |
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21 | +5VDC | Red |
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22 | +5VDC | Red |
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23 | +5 VDC | Red |
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24 | COM | Black |
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