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Chapter 5: UEFI BIOS
4-Core Ratio Limit Override
This increases (multiplies) 4 clock speeds in the CPU core in relation to the bus speed when
four CPU cores are active. Press "+" or "-" on your keyboard to change the value. Enter 42
to use the manufacture default setting.
C states
Use this feature to enable the C-State of the CPU. The options are Disabled and Enabled.
Enhanced C-states
Use this feature to enable the enhanced C-State of the CPU. The options are Disabled and
Enabled.
C-State Auto Demotion
Use this feature to prevent unnecessary excursions into the C-states to improve latency. The
options are Disabled, C1, C3, and C1 and C3.
C-State Un-demotion
This feature allows the user to enable or disable the un-demotion of C-State. The options are
Disabled, C1, C3, and C1 and C3.
Package C-State Demotion
Use this feature to enable or disable the Package C-State demotion. The options are Disabled
and Enabled.
Package C-State Un-demotion
Use this feature to enable or disable the Package C-State un-demotion. The options are
Disabled and Enabled.
CState Pre-Wake
This feature allows the user to enable or disable the C-State Pre-Wake. The options are
Disabled and Enabled.
Package C State Limit
Use this feature to set the Package C-State limit. The options are C0/C1, C2, C3, C6, C7,
C7s, C8, C9, C10, Cpu Default, and Auto.
Monitor/Mwait
Select Enable to enable the Monitor/Mwait instructions. The Monitor instructions monitors
a region of memory for writes, and MWait instructions instruct the CPU to stop until the
monitored region begins to write. The options are Disabled and Enabled.
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