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English
X99 OC Formula
PCIe ON/OFF
Switch
(PCIE_SWITCH)
(see p.1, No. 12)
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 ind out the faulty
one just with a single click
without removing the cards.
Slow Mode Switch
(SLOWMODE)
(see p.1, No. 14)
If Slow Mode is on, the
processor runs at lowest fre-
quency.
BIOS Selection
Switch
(BIOS_SEL1)
(see p.1, No. 28)
BIOS Selection Switch allows
the system to boot from either
BIOS A or BIOS B.
ON
1
2
3
4
1: PCIE1
2: PCIE2
3: PCIE4
4: PCIE5
ON
OFF
A
B
his 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 lip the
BIOS Selection Switch to “B”, then the backup BIOS will take over on the next system boot.
Ater that, use “Secure Backup UEFI” in the UEFI Setup Utility to duplicate a working copy
of the BIOS iles 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 of the system before changing the switch.
2. When you turn of PCIe ON/OFF switch, your PCIE card could be burnt if it was poorly
designed. For more information about your card’s speciications 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.
