Chapter 4: BIOS
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CPU HWPM State Control
*This feature is supported with the use of an intel Xeon E5-1600/E5-2600 v4 series
processor.
Enable CPU HWPM
Select Enable for better CPU energy performance. The options are Disable, HWPM NATIVE
MODE, and HWPM OOB MODE.
Enable CPU Autonomous Cstate
Use this feature to enable CPU Autonomous C State, which converts HALT instructions to
Mwait. The options are Disable and Enable.
CPU C State Control
Package C State Limit
This feature allows the user to set the limit on the C State package register. The options
are C0/C1 State, C2 State, C6 (Non Retention) State, and C6 (Rentention) state.
CPU C3 Report
Select Enabled to allow the BIOS to report the CPU C3 State (ACPI C2) to the operating
system. During the CPU C3 State, the CPU clock generator is turned off. The options are
Disable and Enable.
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 and Enable.
Enhanced Halt State (C1E)
Select Enabled to use Enhanced Halt-State technology, which will signicantly reduce the
CPU's power consumption by reducing the CPU's clock cycle and voltage during a Halt-
state. The options are Disable and Enable.
CPU T State Control
ACPI (Advanced Conguration Power Interface) T-States
Select Enable to support CPU throttling by the operating system to reduce power
consumption. The options are Disable and Enable.
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