Chapter 4: AMI BIOS
4-7
The options are
Enable
and Disable. (Refer to Intel and Microsoft websites for
more information.)
PPIN Control
Select Unlock/Enable to use the Protected-Processor Inventory Number (PPIN) in
the system. The options are
Unlock/Enable
and Unlock/Disable.
Hardware Prefetcher (Available when supported by the CPU)
If set to Enable, 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 Disable and
Enable
.
Adjacent Cache Line Prefetch (Available when supported by the CPU)
Select Enable for the CPU to prefetch both cache lines for 128 bytes as comprised.
Select Disable for the CPU to prefetch both cache lines for 64 bytes. The options
are Disable and
Enable
.
Note
: Please reboot the system for changes on this setting to take effect.
Please refer to Intel’s web site for detailed information.
DCU (Data Cache Unit) Streamer Prefetcher (Available when supported by
the CPU)
If set to Enable, the DCU Streamer Prefetcher will prefetch data streams from the
cache memory to the DCU to speed up data accessing and processing to enhance
CPU performance. The options are Disable and
Enable
.
DCU IP Prefetcher
If set to Enable, the IP prefetcher in the DCU (Data Cache Unit) will prefetch IP
addresses to improve network connectivity and system performance. The options
are
Enable
and Disable.
Direct Cache Access (DCA)
Select Enable to use Intel DCA (Direct Cache Access) Technology to improve the
efficiency of data transferring and accessing. The options are
Enable
and Disable.
X2 APIC (Advanced Programmable Interrupt Controller)
Based on Intel's Hyper-Threading architecture, each logical processor (thread) is as-
signed 256 APIC IDs (APIDs) in 8-bit bandwidth. When this feature is set to Enable,
the APIC ID will expand from 8 bits (X2) to 16 bits to provide 512 APIDs to each
thread for CPU performance enhancement. The options are
Disable
and Enable.
AES-NI
Select Enable to use the Intel Advanced Encryption Standard (AES) New Instruc-
tions (NI) to ensure data security. The options are
Enable
and Disable.
