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1-25Chapter 1: Product introduction
• For a fully congured system, we recommend that you use a power supply unit (PSU)
that complies with ATX 12 V Specication 2.0 (or later version) and provides a minimum
power of 350 W.
• DO NOT forget to connect the 4-pin / 8-pin ATX +12V power plug. Otherwise, the system
will not boot up.
• We recommend that you use a PSU with higher power output when conguring 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.
5. ATX power connectors (24-pin EATXPWR, 8-pin EATX12V)
These connectors are for ATX power supply plugs. The power supply plugs are
designed to t these connectors in only one orientation. Find the proper orientation and
push down rmly until the connectors completely t.
6. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port. Connect
the S/PDIF Out module cable to this connector, then install the module to a slot
opening at the back of the system chassis.
The S/PDIF module is purchased separately.
P8Q77-M
P8Q77-M ATX power connectors
EATXPWR
PIN 1
PIN 1
GND
+5 Volts
+5 Volts
+5 Volts
-5 Volts
GND
GND
GND
PSON#
GND
-12 Volts
+3 Volts
+3 Volts
+12 Volts
+12 Volts
+5V Standby
Power OK
GND
+5 Volts
GND
+5 Volts
GND
+3 Volts
+3 Volts
EATX12V
+12V DC
+12V DC
+12V DC
+12V DC
GND
GND
GND
GND
P8Q77-M
P8Q77-M Digital audio connector
SPDIF_OUT
+5V
SPDIFOUT
GND