Biostar B350GT3 Manual - 2.7 Headers & Connectors
14 | Chapter 2: Hardware installation
BIOS_SW1: Dual BIOS Switch
The Dual BIOS Switch allows you to choose one of the BIOS ROMs (ROM1/ROM2) for boot up.
Main BIOS (ROM1) Enabled
The LED indicator (ROM1_LED) will light
and the Main BIOS is enabled.
Backup BIOS (ROM2) Enabled
The LED indicator (ROM2_LED) will light
and the Backup BIOS is enabled.
Note
»
Do not use this switch when your system is power-on.
»
Before flashing BIOS ROMs, please make sure this switch is set to the BIOS ROM which you want to
update.
2.7 Headers & Connectors
ATXPWR1: ATX Power Source Connector
For better compatibility, we recommend to use a standard ATX 24-pin power supply for this
connector. Make sure to find the correct orientation before plugging the connector.
Pin Assignment
Pin Assignment
13
+3.3V
1
+3.3V
14
-12V
2
+3.3V
15
Ground
3
Ground
16
PS_ON
4
+5V
17
Ground
5
Ground
18
Ground
6
+5V
19
Ground
7
Ground
20
NC
8
PW_OK
21
+5V
9
Standby Voltage+5V
22
+5V
10
+12V
23
+5V
11
+12V
24
Ground
12
+3.3V