Table 12. Processors details (continued)
C1 Enhanced Mode
• Enable
• Disable
Enabling C1E (C1 enhanced) state can save power by
halting CPU cores that are idle. An operating system that
supports C1E state must be installed to take advantage of
this feature. Changing this setting takes effect after the
next reboot. When a preset mode is selected, the low-
level settings are not changeable and will be grayed out. If
user would like to change the settings, please choose
[Custom Mode] in “Operating Mode” and [Legacy]/
[Disable] in “C-States” located under “System Setting”
submenu.
Enable is the default setting.
Note: C1E can only be changeable when C-state is not
“Autonomous”
Hyper-Threading
• Enable
• Disable
Enable Hyper Threading (Software Method to Enable/
Disable Logical Processor threads).
Enable is the default setting.
Notes:
• Changing this setting will require a Power Good reset
to take effect.
• If CPU doesn’t support the feature, it won’t show.
Execute Disable Bit
• Enable
• Disable
The execute disable bit allows memory to be marked as
executable or non-executable when used with a
supporting operating system. This can improve system
security by configuring the processor to raise an error to
the operating system when code attempts to run in non-
executable memory.
Enable is the default setting.
Trusted Execution Technology
• Enable
• Disable
Enable Intel Trusted Execution Technology (Intel TXT).
Disable is the default setting.
Intel Virtualization Technology
• Enable
• Disable
Enable the Virtualization Technology. Enable is the
default setting.
Hardware Prefetcher
• Enable
• Disable
Lightly threaded applications and some benchmarks can
benefit from having the hardware prefetcher enabled.
Enable is the default setting.
Adjacent Cache Prefetch
• Enable
• Disable
Lightly threaded applications and some benchmarks can
benefit from having the adjacent cache line prefetch
enabled. Enable is the default setting.
DCU Streamer Prefetcher
• Enable
• Disable
Lightly threaded applications and some benchmarks can
benefit from having the DCU streamer prefetcher enabled.
Enable is the default setting.
DCU IP Prefetcher
• Enable
• Disable
DCU IP prefetcher is typically best left enabled for most
environments. Enable is the default setting.
DCA
• Enable
• Disable
DCA capable I/O devices such as network controllers can
place data directly into the CPU cache, which improves
response times. Enable is the default setting.
34 ThinkSystem Server with Intel Xeon SP (1st, 2nd Gen) UEFI Manual
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