Supermicro X8DTN+-F-LR User Manual page 83

Chapter 5: AMI BIOS
will enhance overall system performance by providing direct cache access for data
transferring. The options are Enabled and Disabled.
DCA Prefetch Delay
A DCA Prefetch is used with TOE components to prefetch data in order to shorten
execution cycles and maximize data processing effi ciency. Prefetching too fre-
quently can saturate the cache directory and delay necessary cache accesses. This
feature reduces or increases the frequency the system prefetches data. The options
are [8], [16], [24], [32], [40], [48], [56], [64], [72], [80], [88], [96], [104], [112], [120]
Intel VT-d
Select Enabled to enable Intel's Virtualization Technology support for Direct I/O VT-d
by reporting the I/O device assignments to VMM through the DMAR ACPI Tables.
This feature offers fully-protected I/O resource-sharing across the Intel platforms,
providing the user with greater reliability, security and availability in networking and
data-sharing. The settings are Enabled and Disabled.
Active State Power-Management
Select enable to confi gure the power states of PCI-Express L0s and L1 links. The
options are Enabled and Disabled.
IOH PCIE Max Payload Size
Some add-on cards perform faster with the coalesce feature, which limits the
payload size to 128B; while others, with a payload size of 256B which inhibits the
coalesce feature. Please refer to your add-on card user guide for the desired set-
ting. The options are 256B and 128MB.
South Bridge Confi guration
This feature allows the user to confi gure the settings for the Intel South Bridge.
USB Functions
Select Enabled to use onboard USB connections. The Options are: Disabled, and
Enabled. (If this item is set to Enabled, USB 2.0 Controller will be enabled.)
Legacy USB Support
Select Enabled to use Legacy USB devices. If this item is set to Auto, Legacy USB
support will be automatically enabled if a legacy USB device is installed on the
motherboard. The settings are Disabled, Enabled and Auto.
USB 2.0 Controller
Select Enabled to activate USB 2.0 Controller. The options are Enabled and Dis-
abled. (Note: If the item - USB Functions is enabled, USB 2.0 Controller will always
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