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Chapter 7: BIOS
7-13
Execute Disable Bit (Available when supported by the CPU and the OS)
Set to Enabled to enable Execute Disable Bit and allow the processor to classify
areas in memory where an application code can execute and where it cannot, and
thus preventing a worm or a virus from inserting and creating a fl ood of codes to
overwhelm the processor or damage the system during an attack. (This feature is
only available if your OS and your CPU support the Execute Disable Bit function.)
The options are Disabled and Enabled. For more information regarding hardware/
software support for this function, please refer to Intel's and Microsoft's web sites.
Adjacent Cache Line Prefetch (Available when supported by the CPU)
The CPU fetches the cache line for 64 bytes if this option is set to Disabled. The
CPU fetches both cache lines for 128 bytes as comprised if Enabled. The options
are Disabled and Enabled.
Hardware Prefetcher (Available when supported by the CPU)
Set to this option to enabled to enable the hardware components that are used in
conjunction with software programs to prefetch data in order to shorten execution
cycles and maximize data processing effi ciency. The options are Disabled and
Enabled.
Echo TPR
Set to Enabled to prevent xTPR messages from being sent to the system. The
options are Disabled and Enabled.
Intel <R> Virtualization Technology (Available when supported by the CPU)
Select Enabled to use the feature of 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. Note: If there is any change to this setting, you will need to power
off and restart the system for the change to take effect. Please refer to Intel’s web
site for detailed information.
Intel EIST Support (Available when supported by the CPU)
Select Enabled to use the Enhanced Intel SpeedStep Technology and allows the
system to automatically adjust processor voltage and core frequency in an effort
to reduce power consumption and heat dissipation. The options are Enabled and
Disabled. Please refer to Intel’s web site for detailed information.