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SY-P4I845PEISA/GEISA Quick Start Guide
12
Hardware
Installation
ATX 12V Power Supply: ATX PW
A
ttach the ATX 12V Power cable to three connector.
(
This motherboard requires an ATX 12V power suppl
y
,
an AT or ATX power supply can NOT be used.)
When using the Power-On by PS/2 Keyboard function, please make sure the ATX power supply is able to
provide at least 720mA on the 5V Standby lead (5VSB).
PS. Power supply must be compliant to the ATX 12V specification.
A new superset of the original ATX power supply is now defined. Named “ATX 12V,” this
new power supply is comprised of a standard ATX unit plus the following enhancements:
Increased +12 VDC output capability. Motherboard components with unique voltage
requirements are increasingly expected to be powered via DC/DC converters off the
+12 VDC power supply output. This trend is primarily due to the higher power
conversion and transmission efficiencies of +12 VDC relative to +5 VDC or +3.3
VDC. ATX12V power supplies should be designed to accommodate these
increased +12 VDC current requirements and to address associated issues such as
cross-regulation, capacitive loading, transient surge tolerance, cable voltage drop,
and cooling.
New +12V power connector. To enable the delivery of more +12 VDC current to the
motherboard, a new 4-pin receptacle/header combination--the +12V power
connector-has been defined.
The presence of the +12 V power connector indicates
that a power supply is ATX12V; the absence of the +12V power connector
indicates that a supply is ATX.
Please install the ATX power according to the following pin assignment:
Pay special care to the directionality.
3.3V
-
12V
GND
P
S
-
O
N
GND
GND
GND
-
5V
5
V
5V
3.3V
3.3V
GND
5V
GND
5V
GND
PW
-
OK
5VSB
12V
ATX Power
+12V Power Connector
Pin1
COM +12VDC
+12VDC
COM
Pin3