Biostar U8638 - 4-3. ATX 20-pin Power Connector: JATXPWR1; 4-4. ATX 12 V Power Connector: JATXPWR2; 4-5. AUX Power Connector: JAUXPWR1(Optional)

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4-3. ATX 20-pin Power Connector: JATXPWR1
PIN Assignment PIN Assignment
1
3.3V
11
3.3V
2
3.3V
12
-12V
3
Ground
13
Ground
4
5V
14
PS_ON
5
Ground
15
Ground
6
5V
16
Ground
7
Ground
17
Ground
8
PW_OK
18
-5V
9
5V_SB
19
5V
10
12V
20
5V
4-4. ATX 12V Power Connector: JATXPWR2
PIN Assignment PIN Assignment
1
12V
3
Ground
2
12V
4
Ground
4-5. AUX Power Connector:
JAUXPWR1(Optional)
PIN Assignment PIN Assignment
1 Ground 4 3.3V
2 Ground 5 3.3V
3 Ground 6 5V