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EIST PSD Function (Available when SpeedStep is set to Enable)
Use this item to configure the processor's P-State coordination settings. During a P-State,
the voltage and frequency of the processor will be reduced when it is in operation. This
makes the processor more energy efficient, resulting in further energy gains. The options
are HW_ALL, SW_ALL and SW-ANY.
Turbo Mode (Available when SpeedStep is set to Enable)
Select enable to allow the CPU to operate at the manufacturer-defined turbo speed by
increasing CPU clock frequency. This feature is available when it is supported by the CPUs
used in the system. The options are Disable and Enable.
Hardware PM (Power Management) State Control (Available when
"Power Technology" is set to Custom)
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 Disable
and Enable.
CPU C6 Report (Available when Autonomous Core C-State is set to Disable)
Select Enable to allow the BIOS to report the CPU C6 state (ACPI C3) to the operating
system. During the CPU C6 state, power to all caches is turned off. The options are Auto,
Enable, and Disable.
Enhanced Halt State (C1E) (Available when Autonomous Core C-State is set to
Disable)
Select Enable to enable "Enhanced Halt State" support, which will significantly reduce the
CPU's power consumption by minimizing CPU's clock cycles and reduce voltage during a
"Halt State." The options are Disable and Enable.
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Chapter 4: UEFI BIOS
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