<Table> 24 - pin ATX12V 2. x power supply connector <Tr> <Th> Color </Th> <Th> Signal </Th> <Th> Pin </Th> <Th> Pin </Th> <Th> Signal </Th> <Th> Color </Th> </Tr> <Tr> <Td> Orange </Td> <Td> + 3.3 V </Td> <Td> </Td> <Td> 13 </Td> <Td> + 3.3 V </Td> <Td> Orange </Td> </Tr> <Tr> <Td> + 3.3 V sense </Td> <Td> Brown </Td> </Tr> <Tr> <Td> Orange </Td> <Td> + 3.3 V </Td> <Td> </Td> <Td> 14 </Td> <Td> − 12 V </Td> <Td> Blue </Td> </Tr> <Tr> <Td> Black </Td> <Td> Ground </Td> <Td> </Td> <Td> 15 </Td> <Td> Ground </Td> <Td> Black </Td> </Tr> <Tr> <Td> Red </Td> <Td> + 5 V </Td> <Td> </Td> <Td> 16 </Td> <Td> Power on </Td> <Td> Green </Td> </Tr> <Tr> <Td> Black </Td> <Td> Ground </Td> <Td> 5 </Td> <Td> 17 </Td> <Td> Ground </Td> <Td> Black </Td> </Tr> <Tr> <Td> Red </Td> <Td> + 5 V </Td> <Td> 6 </Td> <Td> 18 </Td> <Td> Ground </Td> <Td> Black </Td> </Tr> <Tr> <Td> Black </Td> <Td> Ground </Td> <Td> 7 </Td> <Td> 19 </Td> <Td> Ground </Td> <Td> Black </Td> </Tr> <Tr> <Td> Grey </Td> <Td> Power good </Td> <Td> 8 </Td> <Td> 20 </Td> <Td> Reserved </Td> <Td> None </Td> </Tr> <Tr> <Td> Purple </Td> <Td> + 5 V standby </Td> <Td> 9 </Td> <Td> 21 </Td> <Td> + 5 V </Td> <Td> Red </Td> </Tr> <Tr> <Td> Yellow </Td> <Td> + 12 V </Td> <Td> 10 </Td> <Td> 22 </Td> <Td> + 5 V </Td> <Td> Red </Td> </Tr> <Tr> <Td> Yellow </Td> <Td> + 12 V </Td> <Td> 11 </Td> <Td> 23 </Td> <Td> + 5 V </Td> <Td> Red </Td> </Tr> <Tr> <Td> Orange </Td> <Td> + 3.3 V </Td> <Td> 12 </Td> <Td> 24 </Td> <Td> Ground </Td> <Td> Black </Td> </Tr> <Tr> <Td_colspan="6"> <Ol> <Li> ^ Jump up to: Light - blue background denotes control signals . </Li> <Li> ^ Jump up to: Light - green background denotes the pins present only in the 24 - pin connector . </Li> <Li> Jump up ^ In the 20 - pin connector, pins 13--22 are numbered 11--20 respectively . </Li> <Li> Jump up ^ Supplies + 3.3 V power and also has a second low - current wire for remote sensing . </Li> <Li> Jump up ^ A control signal that is pulled up to + 5 V by the PSU and must be driven low to turn on the PSU . </Li> <Li> Jump up ^ A control signal that is low when other outputs have not yet reached, or are about to leave, correct voltages . </Li> <Li> Jump up ^ Formerly − 5 V (white wire), absent in modern power supplies; it was optional in ATX and ATX12V v1. 2 and deleted since v1. 3 . </Li> </Ol> </Td> </Tr> </Table> <Tr> <Th> Color </Th> <Th> Signal </Th> <Th> Pin </Th> <Th> Pin </Th> <Th> Signal </Th> <Th> Color </Th> </Tr> <Tr> <Td> Orange </Td> <Td> + 3.3 V </Td> <Td> </Td> <Td> 13 </Td> <Td> + 3.3 V </Td> <Td> Orange </Td> </Tr> <Tr> <Td> + 3.3 V sense </Td> <Td> Brown </Td> </Tr>

How does the power supply work in a computer