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Chapter 4: UEFI BIOS
MMIO High Granularity Size
Use this feature to select the high memory size according to memory-address mapping for
the IO hub. The options are 1G, 4G, 16G, 64G, 256G, and 1024G.
Maximum Read Request
Select Auto for the system BIOS to automatically set the maximum size for a read request
for a PCIe device to enhance system performance. The options are Auto, 128 Bytes, 256
Bytes, 512 Bytes, 1024 Bytes, 2048 Bytes, and 4096 Bytes.
MMCFG Base
This feature determines how the lowest MMCFG (Memory-Mapped Configuration) base is
assigned to onboard PCI devices. The options are 1G, 1.5G, 1.75G. 2G, 2.25G, and 3G.
VGA Priority
Use this feature to select the graphics device to be used as the primary video display for
system boot. The options are Auto, Onboard and Offboard.
Disable Unused PLX
Select Enabled to turn off PCIe support when there are no downstream PCIe devices attached
to this device. The options are Enabled and Disabled.
PLX Workaround For NVIDIA GPU
Select Enabled to shut down PLX BAR0 and BAR1 support when a NVIDIA GPU is populated
in the slots. The options are Enabled and Disabled.
PCI Devices Option ROM Settings
Onboard NVME1/NVME2 OPROM
Select EFI to allow the user to boot the computer using an EFI (Extensible Firmware Interface)
device installed on the NVME connector specified by the user. Select Legacy to allow the
user to boot the computer using a legacy device installed on the NVME connector specified
by the user. The options are Disabled, Legacy and EFI.
CPU1 Slot1 PCI-E x16 RSC-R1U-E16R OPROM/ CPU2 Slot2 PCI-E x16 RSC-R1U-E16R
OPROM
Select EFI to allow the user to boot the computer using an EFI (Extensible Firmware Interface)
device installed on the PCIe slot specified by the user. Select Legacy to allow the user to
boot the computer using a legacy device installed on the PCIe slot specified by the user. The
options are Disabled, Legacy and EFI. (Note: Riser card names may differ in each system.)
Onboard Video OPROM (Option ROM)
Use this feature to select the Onboard Video Option ROM type. The options are Do Not
Launch, Legacy and UEFI.
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