Chapter 4: BIOS
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CPU Configuration sub-menu
Processor Configuration Information
This section shows static information on the processor configuration.
Hyper-threading [ALL]
This setting is Enabled for Windows XP and Linux (OS optimized for Hyper-threading
technology), and Disabled for other OSes (any OS not optimized for Hyper-threading
techology). When Disabled, only one thread per enabled core is enabled.
Max CPUID Value Limit
This setting should be Enabled in order to boot legacy OSes that cannot support CPUs with
extended CPUID functions.
Execute Disable Bit
XD can prevent certain classes of malicious buffer overflow attacks when combined with a
supporting OS such as Windows Server 2003 SP1, Windows XP SP2, SuSE Linux 9.2 or
RedHat Enterprise 3 Update 3. Options include Enabled or Disabled.
Intel® Virtualization Technology
Select Enabled to use this Virtualization Technology feature to allow one platform to run
multiple operating systems and applications in independent partitions, creating multiple
“virtual” systems in one physical computer system. The options are Enabled and Disabled.
Please refer to the Intel website for further detailed information.
A full reset of the system is required when you change this setting.
PPIN Control
Use this setting to enable/disable the PPIN control. Options include Unlock/Enable or Unlock/
Disable.
Hardware Prefetcher
This settings allows you to Enable or Disable the Hardware Prefetcher.
Adjacent Cache Prefetch
This setting allows you to Enable or Disable the Adjacent Cache Prefetch.
DCU Streamer Prefetcher
This setting allows you to Enable or Disable the DCU Streamer Prefetcher, which is an L1
data cache prefetcher.
DCU IP Prefetcher
This setting allows you to Enable or Disable the DCU IP Prefetcher, which is an L1 data
cache prefetcher.