IBM NeXtScale System Planning And Implementation Manual page 184

The UEFI page is accessed by pressing F1 during the system initialization
process. Figure 7-5 shows the UEFI settings main panel.
Figure 7-5 UEFI settings main panel
The compute node is designed to provide optimal performance with reasonable
power usage, which depends on the operating frequency and voltage of the
processors and memory subsystem.
In most operating conditions, the default settings provide the best performance
possible without wasting energy during off-peak usage. However, for certain
workloads, it might be appropriate to change these settings to meet specific
power to performance requirements.
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IBM NeXtScale System Planning and Implementation Guide