Supermicro B13SEG Owner's Manual page 67

DMI/PCIe Port MPSS
This feature allows you to configure the Max Payload Size Supported in DMI Device
Capabilities register. Selecting Auto for this feature enables the motherboard to auto-
matically detect the maximum Transaction Layer Packet (TLP) size for the connected
PCIe device, allowing for maximum I/O efficiency. Selecting 128B or 256B designates
maximum packet size of 128 or 256. The options are 128B, 256B, and Auto.
Note: If Auto is not used, make sure MPSS in PCH root ports is updated to the
same or smaller value.
Equalization Bypass to Highest Rate
Enable this feature to bypass the equalization of intermediate data rates. This will
reduce the time for link training in PCIe 5.0 devices. The options are Disable and
Enable.
IOAT Configuration

Relaxed Ordering
Select Yes to enable Relaxed Ordering support. This feature allows certain transactions
to violate the strict-ordering rules of PCI bus for a transaction to be completed prior
to other transactions that have already been enqueued. The options are No and Yes.
Intel® VT for Directed I/O (VT-d)

Intel VT for Directed I/O (VT-d)
®
Select Enable to use Intel Virtualization Technology for Direct I/O VT-d support by
reporting the I/O device assignments to the Virtual Machine Monitor (VMM) through
the DMAR ACPI tables. This feature offers fully-protected I/O resource sharing across
Intel platforms, providing greater reliability, security and availability in networking and
data-sharing. The options are Enable and Disable.
Pre-boot DMA Protection (Available when "Intel
set to Enable)
Enable this feature to help block DMA attacks. The options are Enable and Disable.
Interrupt Remapping (Available when "Intel
to Enable)
Select Enable to support I/O DMA transfer remapping and device-generated interrupts.
The options are Auto, Enable, and Disable.
VT for Directed I/O (VT-d)" is
®
VT for Directed I/O (VT-d)" is set
®
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Chapter 4: UEFI BIOS