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Chapter 7: BIOS
Clock Spread Spectrum
Select Enable to enable Clock Spectrum support, which will allow the BIOS to moni-
tor and attempt to reduce the level of Electromagnetic Interference caused by the
components whenever needed. The options are Disabled and Enabled.
Hyper-threading
Select Enabled to use Hyper-Threading Technology, which will result in increased
CPU performance. The options are Disabled and Enabled.
Active Processor Core
Select Enabled to use a processor's second core and beyond. (Please refer to Intel's
website for more information.) The options are All, 1 and 2.
Limit CPUID Maximum
This feature allows the user to set the maximum CPU ID value. Enable this func-
tion to launch the legacy operating systems that cannot support processors with
extended CPUID functions. The options are Enabled and Disabled (for the Win-
dows OS.)
Execute Disable Bit Capability (Available when supported by the OS and
the CPU)
Set to Enabled to support 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 fl ooding 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.)
Hardware Prefetcher (Available when supported by the CPU)
If enabled, the hardware prefetcher will prefetch streams of data and instructions
from the main memory to the L2 cache in the forward or backward manner to im-
prove CPU performance. The options are Disabled and Enabled.
Adjacent Cache Line Prefetch (Available when supported by the CPU)
If this item is set to Disabled, the CPU prefetches the cache line for 64 bytes. The
CPU prefetches both cache lines for 128 bytes as comprised if this item is set to
Enabled. The options are Disabled and Enabled.
Intel® Virtualization Technology (Available when supported by the CPU)
Select Enabled to use Intel Virtualization Technology which will 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. Note: Please reboot the system for any change in this setting to
take effect. Please refer to Intel's website for detailed information.
7-9
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