Chapter 5: BIOS
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Power Limit Scale
Use this feature to select the scale used for the slot power limit value. The options are
1.0x
, 0.1x, 0.01x, and 0.001x.
Physical Slot Number
Use this feature to set the physical slot number attached to this port. Press "+" or "-" on
your keyboard to change the setting to a value between 0-8191. The default setting is
1
.
Max Payload Size
Select Auto for the system BIOS to automatically set the maximum payload value for a
PCI-E device to enhance system performance. The options are
Auto
, 128, and 256 TLP.
Program PCIe ASPM After OPROM
PCIe ASPM, the Active State Power Management for PCI-Express slots, is a power
management protocol used to manage power consumption of serial-link devices installed
on PCI-E slots during a prolonged off-peak time. If this feature is set to Enabled, PCI-E
ASPM will be programmed after OPROM. If this feature is set to Disabled, the PCI-E
ASPM will be programmed before OPROM. The options are
Disabled
and Enabled.
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 VMM (Virtual Machine Monitor) 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 Disabled and
Enabled
.
SW Guard Extensions (SGX)
Select Enabled to activate Software Guard Extensions (SGX) support. The options are
Disabled, Enabled, and
Software Controlled
.
Select Owner EPOCH Input Type
There are three Owner EPOCH modes (each EPOCH is 64 bit). The options are
No Change
in Owner EPOCHs
, Change to New Random Owner EPOCHs, and Manual User Defined
Owner EPOCHs.
GNA Device (B0:D8:F0)
This feature enables the SA GNA device. The options are
Enabled
and Disabled.
X2APIC Opt Out
X2APIC, an extension of the XAPIC architecture, is designed to support 32-bit processor
addressability. X2APIC enhances the performance of interrupt delivery. The options are
Enabled and
Disabled
.
