29
English
Z97 OC Formula
PCIe ON/OFF
Switch
(PCIE_SWITCH)
(see p.1, No. 33)
PCIe ON/OFF Switch allows
you to enable and disable the
corresponding PCIE x16 slots.
When one of the installed
PCIE x16 cards is out of order,
you can use PCIe ON/OFF
Switch to find out the faulty
one just with a single click
without removing the cards.
Slow Mode Switch
(SLOWMODE)
(see p.1, No. 19)
If Slow Mode is on, the proces-
the proces-
sor runs at lowest frequency.
BIOS Selection
Switch
(BIOS_SEL1)
(see p.1, No. 20)
BIOS Selection Switch allows
the system to boot from either
BIOS A or BIOS B.
ON
1 2 3 4
4:
PC
IE
6
3: P
C
IE
4
2: P
C
IE
2
1:
P
C
IE1
ON
OFF
A
B
This motherboard has two BIOS chips, a primary BIOS (BIOS_A) and a backup BIOS (BIOS_
B), which enhances the safety and stability of your system. Normally, the system will work
on the primary BIOS. However, if the primary BIOS is corrupted or damaged, just flip the
BIOS Selection Switch to “B”, then the backup BIOS will take over on the next system boot.
After that, use “Secure Backup UEFI” in the UEFI Setup Utility to duplicate a working copy
of the BIOS files to the primary BIOS to ensure normal system operation. For safety issues,
users are not able to update the backup BIOS manually. Users may refer to the BIOS LEDs
(BIOS_A_LED or BIOS_B_LED) to identify which BIOS is currently activated.
1. Make sure that you power off the system before changing the switch.
2. When you turn off PCIe ON/OFF switch, your PCIE card could be burnt if it was poorly
designed. For more information about your card’s specifications please contact the card’s
vendor.
3. PCIe ON/OFF switch is for debug only. If you do not want to use your PCIE card, please
remove it from the motherboard.
