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B1SA4-2750F/B1SA4-2550F Motherboard User’s Manual
using a legacy storage device. The options are Do Not Use, UEFI Only Legacy
Only, Legacy First, UEFI First.
PCIe Slot 1 OPROM
Select Enabled to enable Option ROM support to boot the computer using a net-
work interface device install in the slot specied above. The options are Enabled
and Disabled.
Launch Video OPROM Policy
This feature controls how the system executes UEFI (Unied Extensible Firmware
Interface) and video device OPROM. Select Legacy Only to boot the system using
a legacy device installed in a video port. The options are Do Not Use, UEFI Only
Legacy Only, Legacy First, UEFI First.
VGA Priority
This feature allows the user to select the graphics adapter to be used as the primary
boot device. The options are Onboard, and Offboard.
Launch Network OPROM Policy
This feature controls how the system executes UEFI (Unied Extensible Firmware
Interface) and LAN device OPROM. Select Legacy Only to boot the system using
a legacy device installed in a LAN port. The options are Do Not Use, UEFI Only
Legacy Only, Legacy First, UEFI First.
Onboard LAN Option ROM Select
Select iSCSI to use the iSCSI Option ROM to boot the computer using a network
device. Select PXE (Preboot Execution Environment) to use an PXE Option ROM
to boot the computer using a network device. The options are iSCSI and PXE.
Load Onboard LAN1 OPROM / Load Onboard LAN2 OPROM
Select Enabled to enable the onboard LAN1 Option ROM~LAN4 Option ROM.
This is to boot the computer using a network device. The default setting for LAN1
Option ROM is Enabled, and the default settings for LAN2 Option ROM/LAN3
Option ROM/LAN4 Option ROM are Disabled.
ACPI Settings
High Precision Event Timer
Select Enabled to activate the High Performance Event Timer (HPET) that produces
periodic interrupts at a much higher frequency than a Real-time Clock (RTC) does in
synchronizing multimedia streams, providing smooth playback and reducing the de-
pendency on other timestamp calculation devices, such as an x86 RDTSC Instruc-
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