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3.3.2 Power & Performance
Figure 2-3-2 : Power & Performance
3.3.2.1 CPU - Power Management Control
Figure 2-3-3 : CPU - Power Management Control
Boot performance mode
Select the performance state that the BIOS will set starting from reset vector.
Intel® SpeedStep™
Allows more than two frequency ranges to be supported.
Race To Halt (RTH)
Enable/Disable Race To Halt feature. RTH will dynamically increase CPU frequency in order
to enter pkg C-State faster to reduce overall power. (RTH is controlled through MSR 1FC bit
20).
Intel® Speed shift Technology
Enable/Disable Intel® Speed Shift Technology support. Enabling will expose the CPPCv2
interface to allow for hardware controlled P-states.
Turbo Mode
Enable/Disable processor Turbo Mode (requires Intel Speed Step or Intel Speed Shift to be
available and enabled).
Config TDP Configurations
Config TDP Configurations.
C states
Enable or disable CPU Power Management. Allows CPU to go to C states when it's no 100%
utilized.
Enhanced C-states
Enable/disable C1E. When enabled, CPU will switch to minimum speed when all cores enter C-
State.
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