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Chapter 4: UEFI BIOS
*If the feature above is set to BIOS Controls EPB, the following features will be
available for configuration:
ENERGY_PERF_BIAS_CFG Mode
The Energy Perfomance BIAS (EPB) feature allows you to configure CPU power and per-
fomance settings. Select Maximum Performance to set the highest performance. Select
Performance to optimize performance over energy efficiecy. Select Balanced Perfomance
to priortize performance optimization while conserving energy. Select Balanced Power
to prioritize energy conservation while maintaining good performance. Select Power to
optimize energy efficency over performance. The options are Maximum Performance,
Performance, Balanced Performance, Balanced Power, and Power.
CPU P State Control
This feature allows you to configure the following CPU power settings:
Uncore Freq Scaling (UFS)
Use this feature to enable or disable uncore frequency scaling. The options are Enable
and Disable.
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
Disable and Enable. This feature must be set to Enable to be able to configure the next
two features.
Config TDP
Use this feature to configure the TDP level. The options are Nominal, Level 1, and Level
2.
EIST PSD Funtion
This feature allows you to choose between Hardware and Software to control the proces-
sor'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. The
options are HW_ALL and SW_ALL.
Energy Efficient Turbo
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