Dell PowerEdge C6220 Hardware Owner's Manual page 58

Option
Energy Efficient Policy
(Max Performance default)
Option
Chassis PSU Configuration
Power Capping
Energy Throttling
58 | Installing System Components
Description
This field sets the Energy Efficient Policy to
Performance mode, Balanced mode, or Low Power
mode.
This option works while the OS is not supported power
management control of processor only.
Description
The option provides management and monitoring of
PSUs and the minimum set of requirements that this
server must satisfy.
The setting controls PSU power, servers loading limited
in selected watts.
This is the policy to take effect when the server detects
a PSU emergency failure.