Supermicro X11DDW-L/NT User Manual page 85

Execute Disable Bit (Available if supported by the OS & the CPU)
Select Enable for Execute Disable Bit support 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,
damaging the system during a virus attack. The options are Enable and Disable. (Refer to
Intel and Microsoft websites for more information.)
Intel Virtualization Technology (Available when two processors are installed on the
motherboard)
Select Enable to use Intel Virtualization Technology which will allow multiple workloads to
share the same set of common resources. On shared virtualized hardware, various workloads
(or tasks) can co-exist, sharing the same resources, while functioning in full independence
from each other, and migrating freely across multi-level infrastructures and scale as needed.
The settings are Enable and Disable.
PPIN Control
Select Unlock/Enable to use the Protected-Processor Inventory Number (PPIN) in the system.
The options are Unlock/Enable and Lock/Disable.
Hardware Prefetcher (Available when supported by the CPU)
If this feature is set to Enable, the hardware prefetcher will prefectch data from the main
system memory to Level 2 cache to help expedite data transactions for memory performance
enhancement. The options are Disable and Enable.
Adjacent Cache 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 power off and reboot the system for the changes you've made to take
effect. Please refer to Intel's website for detailed information.
DCU Streamer Prefetcher (Available when supported by the CPU)
If this feature is set to Enable, the DCU (Data Cache Unit) streamer prefetcher will prefetch
data streams from the cache memory to the DCU (Data Cache Unit) to speed up data
accessing and processing to enhance CPU performance. The options are Disable and Enable.
DCU IP Prefetcher
This feature allows the system to use the sequential load history, which is based on the
instruction pointer of previous loads, to determine whether the system will prefetch additional
lines. The options are Enable and Disable.
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Chapter 4: UEFI BIOS