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Chapter 4: AMI 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 (ALL)
Select Enabled to support Intel Hyper-threading Technology to enhance CPU per-
formance. The options are Enabled and Disabled.
Cores Enabled
Set a numeric value to enable the number of cores. (Please refer to Intel's website
for more information.) Enter 0 to enable all cores.
Execute Disable Bit (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 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.)
PPIN Control
Select Enable to unlock the PPIN control. 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.
Adjacent Cache 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.
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