Gigabyte GA-990FXA-UD3 User Manual page 23

1/2) ATX_12V/ATX (2x4 12V Power Connector and 2x12 Main Power Connector)
With the use of the power connector, the power supply can supply enough stable power to all the com-
ponents on the motherboard. Before connecting the power connector, first make sure the power supply
is turned off and all devices are properly installed. The power connector possesses a foolproof design.
Connect the power supply cable to the power connector in the correct orientation. The 12V power con-
nector mainly supplies power to the CPU. If the 12V power connector is not connected, the computer will
not start.
To meet expansion requirements, it is recommended that a power supply that can withstand high
power consumption be used (500W or greater). If a power supply is used that does not provide
the required power, the result can lead to an unstable or unbootable system.
12
1
ATX
8
5
ATX_12V
ATX:
Pin No. Definition
24
1 3.3V
2 3.3V
3 GND
4 +5V
5 GND
6 +5V
7 GND
8 Power Good
9 5VSB (stand by +5V)
10 +12V
11 +12V (Only for 2x12-pin ATX)
12 3.3V (Only for 2x12-pin ATX)
13
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ATX_12V:
Pin No. Definition
1 GND (Only for 2x4-pin 12V)
4
2 GND (Only for 2x4-pin 12V)
3 GND
4 GND
1
5 +12V (Only for 2x4-pin 12V)
6 +12V (Only for 2x4-pin 12V)
7 +12V
8 +12V
Pin No. Definition
13 3.3V
14 -12V
15 GND
16 PS_ON (soft On/Off)
17 GND
18 GND
19 GND
20 -5V
21 +5V
22 +5V
23 +5V (Only for 2x12-pin ATX)
24 GND (Only for 2x12-pin ATX)
Hardware Installation