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Chapter 4: AMI BIOS
4-7
Active Processor Cores
This feature determines how many CPU cores will be activated for each CPU. When
all is selected, all cores in the CPU will be activated. (Please refer to Intel's web
site for more information.) The options are
All, 1, 2, and 3.
Limit CPUID Maximum
Select Enabled to set the maximum CPU ID value and to boot a legacy OS that
cannot support processors with extended CPUID functions. The options are Enabled
and
Disabled (for the Windows OS).
Execute Disable Bit (Available if supported by the OS & the CPU)
Set to Enabled to enable the Execute Disable Bit to 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
Enabled
.
(Refer to Intel and Microsoft Web Sites for more information.)
Intel® Virtualization Technology (Available when supported by the CPU)
Select Enabled to use the Intel Virtualization Technology to allow one platform to
run multiple operating systems and applications in independent partitions, creat-
ing multiple "virtual" systems in one physical computer. The options are
Enabled
and Disabled.
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 Disabled and
Enabled .
Adjacent Cache Line Prefetch (Available when supported by the CPU)
Select Enabled for the CPU to prefetch both cache lines for 128 bytes as comprised.
Select Disabled for the CPU to prefetch both cache lines for 64 bytes. The options
are Disabled and
Enabled .
Note : If there is any change to this setting, you will need to power off and
reboot the system for the change to take effect. Please refer to Intel’s
web site for detailed information.
CPU AES
Select Enable for Intel CPU Advanced Encryption Standard (AES) Instructions sup-
port to enhance data integrity. The options are
Enabled and Disabled.