Chapter 4: AMI BIOS
Clock Spread Spectrum
If this feature is set to Enabled, the BIOS will monitor the level of electromagnetic interference caused by the components and will attempt to reduce the interference whenever needed. The options are Enabled and Disabled.
Hyper-threading
Select Enabled to support Intel
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.
