Gigabyte Z390 AORUS XTREME - Onboard Buttons, Switches and Leds

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Hardware Installation
1-8 Onboard Buttons, Switches and LEDs
BIOS Switches and BIOS LED Indicators
The BIOS switch (BIOS_SW) allows users to easily select a different BIOS for boot up or overclocking, helping to
reduce BIOS failure during overclocking. The SB switch allows enabling or disabling of the Dual BIOS function.
The LED indicator (MBIOS_LED/BBIOS_LED) shows which BIOS is active.
2: Backup BIOS (Boot from the backup BIOS)
1: Main BIOS (Boot from the main BIOS)
BIOS_SW
2: Single BIOS
1: Dual BIOS
SB
F_USB30
F_U B_ 
F_  F_ 
 _ B
BS_ B
SB_ B
_S  S_ _ B _U _ B
 
 
S  
 
123
 
123
 
123
 
123
1
1
1
1
BSS
S
_S 
SSU
 
1 2 3 4 5
 S3
BSSS

U
 __ 3
F_USB3F
S  _ S  _
S  _
SF
 
B_
B_
F _0
S S
_0F
_F
_
_
__B
 
U
S  _S
_
SF_
USB0_B
B_
F_USB3

F_USB303

_

_3U
S_
1 2
F_USB30
F_U B_ 
F_  F_ 
 _ B
BS_ B
SB_ B
_S  S_ _ B _U _ B
 
 
S  
 
123
 
123
 
123
 
123
1
1
1
1
BSS
S
_S 
SSU
 
1 2 3 4 5
 S3
BSSS

U
 __ 3
F_USB3F
S  _ S  _
S  _
SF
 
B_
B_
F _0
S S
_0F
_F
_
_
__B
 
U
S  _S
_
SF_
USB0_B
B_
F_USB3

F_USB303

_

_3U
S_
1 2
F_USB30
F_U B_ 
F_  F_ 
 _ B
BS_ B
SB_ B
_S  S_ _ B _U _ B
 
 
S  
 
123
 
123
 
123
 
123
1
1
1
1
BSS
S
_S 
SSU
 
1 2 3 4 5
 S3
BSSS

U
 __ 3
F_USB3F
S  _ S  _
S  _
SF
 
B_
B_
F _0
S S
_0F
_F
_
_
__B
 
U
S  _S
_
SF_
USB0_B
B_
F_USB3

F_USB303

_

_3U
S_
1 2
F_USB30
F_U B_ 
F_  F_ 
 _ B
BS_ B
SB_ B
_S  S_ _ B _U _ B
 
 
S  
 
123
 
123
 
123
 
123
1
1
1
1
BSS
S
_S 
SSU
 
1 2 3 4 5
 S3
BSSS

U
 __ 3
F_USB3F
S  _ S  _
S  _
SF
 
B_
B_
F _0
S S
_0F
_F
_
_
__B
 
U
S  _S
_
SF_
USB0_B
B_
F_USB3

F_USB303

_

_3U
S_
1 2
MBIOS_LED (The main BIOS is active)
BBIOS_LED (The backup BIOS is active)
BIOS LED Indicators:
BIOS_SW
MBIOS_LED
BBIOS_LED
SB
Status LEDs
The status LEDs show whether the CPU, memory, graphics card, and operating system are working properly
after system power-on. If the CPU/DRAM/VGA LED is on, that means the corresponding device is not working
normally; if the BOOT LED is on, that means you haven't entered the operating system yet.
CPU: CPU status LED
DRAM: Memory status LED
VGA: Graphics card status LED
BOOT: Operating system status LED
CPU DRAM
VGA BOOT
Before setting the SB switch, be sure to turn off your computer and power supply.