Power supply connectors

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PSU Connectors
24(20+4)-pin Main Connector
– connects to motherboards
– 20-pin for ATX12V 1.x
– 24-pin for ATX12V 2.x (provide extra power to PCI-E slots)
4-pin (Big) Peripheral Connector
– connects to ATA devices (IDE HDD/ODD), fans, case lightings, etc.
– a.k.a. “4 pin Molex”
4-pin (Small) Floppy Connector
– connects to floppy drive
– sometimes used to provide auxiliary power to AGP video cards
15-pin SATA Connector
– connects to Serial ATA devices (SATA HDD/ODD)
4-pin ATX12V Connector
– connects to the motherboard
– a.k.a. “P4” cable
– added two +12V lines to power the CPU and motherboard
8(4+4)-pin EPS12V Connector
– connects to the motherboard (newer models)
– a.k.a. “P8” cable
– added four +12V lines to power the CPU and motherboard
6-pin PCI-E Connector
– connects to PCI-E expansion cards
– a.k.a. “PEG” (PCI-E Graphics)
– provide auxiliary power to PCI-E video cards that require >75W
8(6+2)-pin PCI-E Connector
– connects to PCI-E expansion cards
– provide auxiliary power to PCI-E video cards that require >75W
PSU Standards
AT
– introduced by IBM in 1986
ATX
– introduced by Intel in 1996
ATX12V 1.3
– introduced in 2003
– added two extra connectors to ATX power supplies: the 4-pin ATX12V connector and 6-pin auxiliary power connector
– ATX12V 1.3 introduced the Serial ATA power connector.
ATX12V 2.x
– introduced in 2007
– upgraded the main motherboard power connector to a 24-pin model
– introduced the PCI Express auxiliary power connector
EPS12V
– introduced in 2007
– created by SSI (Server System Infrastructure) for entry-level servers
– added a new CPU power plug, called “EPS12V”
Any PSU that only has one (1) +12V rail automatically falls into the v1.3 specs. A PSU with two (2) or more +12V rails will fall under one the v2.x specification.

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