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CPU P State Control
This feature allows the user to configure the following CPU power settings
Speedstep (Pstates)
Intel SpeedStep Technology allows the system to automatically adjust processor voltage and
core frequency to reduce power consumption and heat dissipation. The options are Disabled
and Enabled.
EIST PSD Funtion
This feature allows the user to choose between Hardware and Software to control the
processor's frequency and performance (P-state). In HW_ALL mode, the processor hardware
is responsible for coordinating the P-state, and the OS is responsible for keeping the P-state
request up to date on all logical processors. In SW_ALL mode, the OS Power Manager
is responsible for coordinating the P-state, and must initiate the transition on all Logical
Processors. In SW_ANY mode, the OS Power Manager is responsible for coordinating the
P-state and may initiate the transition on any Logical Processors. Options available: HW_ALL/
SW_ALL/SW_ANY. Default setting is HW_ALL.
Turbo Mode
This feature will enable dynamic control of the processor, allowing it to run above stock
frequency. The options are Disable and Enable.
Hardware PM State Control
Hardware P-States
If this feature is set to Disable, hardware will choose a P-state setting for the system based
on an OS request. If this feature is set to Native Mode, hardware will choose a P-state setting
based on OS guidance. If this feature is set to Native Mode with No Legacy Support, hardware
will choose a P-state setting independently without OS guidance. The options are Disable,
Native Mode, Out of Band Mode, and Native Mode with No Legacy Support.
CPU C State Control
Autonomous Core C-State
Select Enable to support Autonomous Core C-State control which will allow the processor
core to control its C-State setting automatically and independently. The options are Enable
and Disable.
CPU C6 Report
Select Enabled to allow the BIOS to report the CPU C6 State (ACPI C3) to the operating
system. During the CPU C6 State, the power to all cache is turned off. The options are
Disable , Enable, and Auto.
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Chapter 6: UEFI BIOS
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