Intel ATX12V / ATX Version 3 (doc 336521)

ATX12V 4-Pin CPU Power Connector Pinout

The 4-pin ATX12V connector (historically known as the P4 connector) supplies dedicated +12 V power directly to desktop motherboard processor voltage regulation modules.

Pin assignment

Ground
Power

Schematic face view, not to scale · numbering per Intel ATX12V / ATX Version 3 (doc 336521)

Pin assignment of ATX-12V 4-Pin CPU Power Connector
Signal	Function	Status
GND	Ground Return	Standard
GND	Ground Return	Standard
+12V	+12 VDC CPU Power Rail	Standard
+12V	+12 VDC CPU Power Rail	Standard

Pin details

Select a pin on the diagram or table for full details.

About this connector

Standard 4-pin ATX12V P4 CPU power connector providing dedicated +12 V rails and ground returns for motherboard processor voltage regulator circuits.

Specifications

Standard: Molex Mini-Fit Jr. 4-pin (2x2)
Positions: 4

Primary sources

Intel ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide, doc 336521 rev 2.1a (2023), Table 5-5 "+12V Power Connector (4-Pin)"

Help keep this page accurate

Checked this pinout against your board or connector? Confirm it, or report a pin, voltage or orientation that does not match.

Report a problem Confirm this pinout

Opens a public form on GitHub with this page already filled in; a free GitHub account is needed. How reports and confirmations work