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Chapter 4: AMI BIOS
Execute-Disable Bit Capability (Available if supported by the OS & the CPU)
Select Enabled to enable the Execute-Disable Bit which will allow the processor
to designate areas in the system memory where an application code can execute
and where it cannot, thus preventing a worm or a virus from flooding illegal codes
to overwhelm the processor or damage the system during an attack. The default is
Enable. (Refer to Intel and Microsoft Web sites for more information.)
PPIN Control
Select Unlock/Enable to unlock the Protected Processor Inventory Number (PPIN)
control. The options are Unlock/Enable and Unlock/Disable.
Hardware Prefetcher (Available when supported by the CPU)
If set to Enabled, the hardware prefetcher will prefetch streams of data and instruc-
tions from the main memory to the L2 cache to improve CPU performance. The
options are Disable and Enable.
Adjacent Cache Prefetch (Available when supported by the CPU)
The CPU prefetches the cache line for 64 bytes if this feature is set to Disable.
The CPU prefetches both cache lines for 128 bytes as comprised if this feature is
set to Enable.
DCU Streamer Prefetcher (Available when supported by the CPU)
Select Enabled to enable the DCU (Data Cache Unit) Streamer Prefetcher which
will stream and prefetch data and send it to the Level 1 data cache to improve data
processing and system performance. The options are Disable and Enable.
DCU IP Prefetcher (Available when supported by the CPU)
Select Enabled for DCU (Data Cache Unit) IP Prefetcher support, which will prefetch
IP addresses to improve network connectivity and system performance. The options
are Disable and Enable.
Direct Cache Access (DCA)
Select Enabled to use Intel's DCA (Direct Cache Access) Technology to improve
data transfer efficiency. The options are Disable, Enable, and Auto.
X2APIC
Select Enable to activate APIC (Advanced Programmable Interrupt Controller) sup-
port. The options are Enable and Disable.
AES-NI
Select Enable to use the Intel Advanced Encryption Standard (AES) New Instruc-
tions (NI) to ensure data security. The options are Enable and Disable.
4-7
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