Supermicro X7DWN Plus User Manual page 73

Chapter 4: BIOS
C1/C2 Enhanced Mode (Available when supported by the CPU.)
Set to Enabled to enable Enhanced Halt State to lower CPU voltage/frequency to
prevent overheat. The options are Enabled and Disabled. (Note: please refer to
Intel's web site for detailed information.)
Execute Disable Bit (Available when supported by the CPU and the OS.)
Set to Enabled to enable Execute Disable Bit and allow the processor to classify
areas in memory where an application code can execute and where it cannot, and
thus preventing a worm or a virus from inserting and creating a fl ood of codes
to overwhelm the processor or damage the system during an attack. Note: this
feature is available when your OS and your CPU support the function of Execute
Disable Bit. The options are Disabled and Enabled. For more information, please
refer to Intel's and Microsoft's web sites.
Adjacent Cache Line Prefetch (Available when supported by the CPU.)
The CPU fetches the cache line for 64 bytes if this option is set to Disabled. The
CPU fetches both cache lines for 128 bytes as comprised if Enabled. The options
are Disabled and Enabled.
Hardware Prefetch (Available if supported by the CPU.)
Set to this option to Enabled to enable the hardware components that are used
in conjunction with software programs to prefetch data in order to speed up data
processing. The options are Disabled and Enabled.
Set Maximum Ext. CPUID=3
When set to Enabled, the Maximum Extended CPUID will be set to 3. The options
are Disabled and Enabled.
Direct Cache Access (Available when supported by the CPU.)
Set to Enable to route inbound network IO traffi c directly into processor caches
to reduce memory latency and improve network performance. The options are
Disabled and Enabled.
DCA Delay Clocks (Available when supported by the CPU.)
This feature allows the user to set the clock delay setting from snoop to prefetch
for Direct Cache Access. Select a setting from 8 (bus cycles) to 120 (bus cycles)
(in 8-cycle increment). The default setting is 32 (bus cycles).
Intel <R> Virtualization Technology (Available when supported by the CPU.)
Select Enabled to use the feature of Virtualization Technology to allow one platform
to run multiple operating systems and applications in independent partitions, creating
4-15