1.10.2 Internal connectors Asus prime Asus M3A78

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3. 

ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)
These connectors are for an ATX power supply. The plugs from the power supply are 

designed to fit these connectors in only one orientation. Find the proper orientation and 

push down firmly until the connectors completely fit.

R

M3A78

M3A78 ATX Power Connector

EATXPWR

+3 Volts

+3 Volts

Ground

+5 Volts

+5 Volts

Ground

Ground

Power OK

+5V Standby

+12 Volts

-5 Volts

+5 Volts

+3 Volts

-12 Volts

Ground

Ground

Ground

PSON#

Ground

+5 Volts

+12 Volts

+3 Volts

+5 Volts

Ground

GND

+12V DC

GND

+12V DC

ATX12V

•  We recommend that you use an ATX 12 V Specification 2.0-compliant power supply 

unit (PSU) with a minimum of 300 W power rating. This PSU type has 24-pin and 4-pin 

power plugs. 

•  If you intend to use a PSU with 20-pin and 4-pin power plugs, ensure that the 20-pin 

power plug can provide at least 15 A on +12 V and that the PSU has a minimum power 

rating of 300 W. The system may become unstable or may not boot up if the power is 

inadequate.

•  Do not forget to connect the 4-pin ATX +12 V power plug. Otherwise, the system will not 

boot up.

•  We recommend that you use a PSU with higher power output when configuring a 

system with more power-consuming devices or when you intend to install additional 

devices. The system may become unstable or may not boot up if the power is 

inadequate.

•  If you are uncertain about the minimum power supply requirement for your system, 

refer to the Recommended Power Supply Wattage Calculator at http://support.asus.

com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.

Chapter 1: Product introduction

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