1.10.2 Internal connectors Asus prime Asus M3A78-EM

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ASUS M3A78-EM

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Never connect a USB cable to the IEEE 1394a connector. Doing so will damage 

the motherboard!

You can attach a FireWire/1394 cable to this connector if your chassis suppots 

the front panel IEEE1394 port. Connect the 1394 cable to ASUS Q-Connector 

(1394, red) first, and then install the Q-Connector (1394) to the 1394 connector 

onboard.

13.. 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.

•  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, make sure 

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. 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.

•  You must install a PSU with a higher power rating if you intend to install 

additional devices.

M3A78-EM ATX Power Connector

R

M3A78-EM

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