Supermicro X12DPFR-AN6 User Manual page 71

Activate SST-BF (Speed Select Technology-Base Frequency)
Select Enable for Intel Speed Select Technology-Base Frequency support. The options
are Disable and Enable.
Configure SST-BF (Speed Select Technology-Base Frequency)
When this feature is set to Enable, the system BIOS will configure SST-BF High Priority
Core settings so that system software does not have to configure these settings. The
options are Enable and Disable.
EIST PSD Function (Available when "SpeedStep" is set to Enable)
This feature reduces the latency that occurs when one P-state changes to another, thus
allowing the transitions to occur more frequently. This will allow for more demand-based
P-state switching based on real-time energy needs of applications and optimize the pow-
er-to-performance balance for energy efficiency. The options are HW_ALL and SW_ALL.
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
processors used in the system. The options are Disable and Enable.
CPU Flex Ratio Override (Available when supported by the CPU installed on the
motherboard)
Select enable to override the CPU Flex-Ratio setting, which is the minimum multiplier
that allows the computer to clock. The options are Enable and Disable.
CPU Core Flex Ratio (Available when supported by the CPU installed on the
motherboard and when "CPU Flex Ratio Override" is set to Enable)
Use this feature to configure the Core Ratio Multiplier settings for non-Turbo mode pro-
cessors. The default setting is 23.
Hardware PM State Control (Available when "Power Technology" is

set to Custom)
Hardware P-States
If this feature is set to Disable, system 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 the OS guidance. If this feature is set to Native Mode
with No Legacy Support, system 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.
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Chapter 4: UEFI BIOS