Chapter 4: AMI BIOS
4-11
Intel I/OAT
The Intel I/OAT (I/O Acceleration Technology) signifi cantly reduces CPU overhead
by leveraging CPU architectural improvements, freeing resources for more other
tasks. The options are Disabled and Enabled.
DCA Technology (Available when Intel I/OAT is enabled)
Select Enabled to use Intel's DCA (Direct Cache Access) Technology to enhance
data transfer effi ciency. 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 frequently
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 options are Enabled and Disabled.
Active State Power Management
Select Enabled to use the power management for signal transactions between the
PCI Express L0 and L1 Links. Select Enabled to confi gure PCI-Exp. L0 and L1 Link
power states. The options are Disabled and Enabled.
IOH PCI-E 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 128B.
South Bridge Confi guration
USB Functions
Select Enabled to use USB devices. The Options are: Disabled and Enabled.
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