Table 10. Operating modes details (continued)
Memory Power Management
• Automatic
• Disabled
[Disabled] provides maximum performance but minimum
power savings. [Automatic] is suitable for most
applications. 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, choose [Custom
Mode] in "Operating Mode" located under "System
Setting" submenu.
Disabled is the default setting.
CPU P-state Control
• None
• Legacy
• Autonomous
• Cooperative
Select the method to control CPU P-states (performance
states). [None] disables all P-states and the CPUs run at
either their rated frequency or in turbo mode (if turbo is
enabled). When [Legacy] is selected, the CPU P-states
will be presented to the operating system (OS) and the OS
power management (OSPM) will directly control which P-
state is selected. With [Autonomous], the P-states are
controlled fully by system hardware. No P-state support is
required in the OS or VM. [Cooperative] is a combination
of Legacy and Autonomous. The P-states are still
controlled in hardware but the OS can provide hints to the
hardware for P-state limits and the desired setting. 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” located under “System Setting”
submenu.
Autonomous is the default setting.
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.
C1E is changeable only when C-state is not
Autonomous.
Enable is the default setting.
UPI Link Frequency
• Minimal Power
• Balanced
• Max
Performance
Select the desired CPU UPI link frequency. [Maximum
Performance] mode maximizes performance. [Balanced]
mode offers a balance between performance and power.
[Minimal Power] maximizes power savings. 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, choose [Custom Mode] in
“Operating Mode” located under “System Setting”
submenu.
Max Performance is the default setting.
28 ThinkSystem Server with Intel Xeon SP (1st, 2nd Gen) UEFI Manual
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