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Chapter 7: BIOS
Active Processor Cores
Set to Enabled to use a processor's second core and above. (Please refer to Intel's
website for more information.) The options are All, 1, 2, 4, and 6.
Limit CPUID Maximum
Use this feature to set the maximum CPU ID value. Select Enabled to boot a legacy
operating system that cannot support processors with extended CPUID functions.
The options are Enabled and Disabled (for the Windows XP OS).
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 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.)
Intel® AES-NI
Select Enable to use the Intel Advanced Encryption Standard (AES) New
Instructions (NI) to ensure data security. 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
instructions 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)
The CPU prefetches the cache line for 64 bytes if this feature is set to Disabled.
The CPU prefetches both cache lines for 128 bytes as comprised if this feature is
set to Enabled.
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 Disabled and Enabled.
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 Disabled and Enabled.
7-5
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