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PSU connectors

More info on PSU connectors here >>

 

PSU compatibility list PSU measurements PSU comparison chart how to choose a psu How to test a PSU how to test a psu

           
   

 

Name & Description

Picture

Pinout & Colour codes

 
 

1

Main ATX Connector:

24pin (or 20+4) and older 20Pin

Main power connector.

Suitable for EPS / ATX boards.

 

The white -5Volt wire (pin 20) became obsolete with the removal of the ISA bus on modern boards. It is now missing on all 24pin connectors. See our PSU page for older PSUs with -5V wire.

 

Some Dell, WTX or AMD PSUs may have connectors with a different pinout.

 

Some HP Pavilion Slimline Computers require a PSU with a Mini 24pin

connector (37mm wide).

Ask for an adaptor.

 

Some wires, usually the orange wire at pin 13, may have a thinner brown wire attached to them. This is a sensor which monitors the voltage in the wire.

20+4pin PSU connector

20pin: 43mm long

24pin: 51mm long

24 pin PSU connector pinout

 
   

24pin PSU motherboard connection

 

<<<< Note that an ATX  PSU with 24 pin can be plugged into a motherboard which has a 20pin socket. The 4 unused pins (black, red, yellow and orange wires) are simply left hanging. There is only one way the connector can be plugged in so there is no risk of error.

This may not be possible if some motherboard components are too closed to the socket and prevent the 24pin connector to be pushed all the way down. In this case ask for a 24 to 20 pin adaptor or cut the unused 4pin.

 
 

2

Molex drive connector:

4 Pin 5.25" drive connector for

CD ROM, DVD ROM, HDD.

Molex connector

Molex connector pinout

 
 

3

Berg drive connector:

4 Pin 3.5" Connector for Floppy Drive and other peripherals.

berg floppy connector

floppy connector pinout

 
 

4

SATA HDD Connector

Note that the orange +3.3V wire is not always present. SATA adaptors connected to a Molex do not include it. Most drives do not require this +3.3V wire.

Sata connector

sata connector pinout

 
 

5

3 Pin Fan Connector

(Obsolete. PSU fans are now controled

by the PSU itself rather than the motherboard)

psu fan connector

   
 

6

8 Pin EPS connector: (Entry-level Power Supply) required on dual CPU boards.

On Big PSUs only.

May be supplied as 2x4pin connectors.

8pin eps connector

 

8pin eps connector pinout

 
 

7

ATX 12V connector:

4 Pin connector for Pentium 4

12v p4 psu connector

12v p4 connector pinout

 
 

8

Auxiliary ATX connector:

Sometimes required on old boards with AMD Dual CPUs to provide more power. Replaced in 2004 by the 24pin connector, this 6pin connector is now obsolete (the extra 3.3V and 5V rails it provided are now incorporated in the 24pin connector). See our PSU page for older PSU with Aux ATX Connector.

(Not to be mistaken for the P8 or P9 ATX connectors which look the same)

 

auxiliary atx psu connectoraux atx psu connector

aux atx psu connector pinout

 
 

9

 

PCI Express GFX connector:

6 Pin connector for PCI Express graphic cards. Mainly found on big PSUs.

Pin2 can be found empty, although the norm required a 12V yellow wire.

6pin pci express connector

6pin pci express connector pinout

 
 

10

PCI Express connector:

8 Pin connector for PCI Express graphic cards. Can be an 8pin or 6+2pin connector. Mainly found on big PSUs.

Pins 6 and 8 Can be beveled or square. A beveled pin is universal and fits any socket. Pin2 can be found empty, although the norm required a 12V yellow wire.

8pin PCI Express connector 8Pin PCI Express Connector pinout  
 

11

AT P8 & P9 Connectors:

Only on old AT PSU.

P8 and P9 connector MUST be plugged in so that the black wires are side by side (together in the center)

(Not to be mistaken for the Auxilairy ATX connector which looks the same)

P8 P9 AT connectors

P8 P9 AT connector pinout

 
 

12

AT Switch:

Only on old AT PSU

AT PSU switch

   

 

 

More information on PSU Connectors and Pinouts here:

 

 

 

 

 

 

 

PSU certifications

 

 

 

 

 

 

 

 

Logo

Abbreviation

Area covered

 Certification

CE

European Community

 CE mark

BSMI

Taiwan

 Bureau of Standards, Metrology and

 Inspection

CB

 

 Show compliance to various international

 standards

CCC

China

 China Compulsory Certificate

FCC

USA

 Federal Communications Commission

CSA

Canada

 Canadian Standards Association

Gost-R

Russia

 Gost Russia

N

Norway

 Nemko

RU

USA

 

TUV

Germany

 Technischer Überwachungsverein

VDE

Germany

 Verband Der Elektrotechnik

GS

Germany

 Geprüfte Sicherheit

UL

USA

 Underwriters Laboratories

S

Sweden

 Semko

FI

Finland

 Fimko

D

Denmark

 Demko

     80+

   

 

           

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                              Updated on 10-05-17. Evercase Technology. All rights reserved,  Email the webmaster.

 
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