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80 PLUS is a performance specification for power supplies used within servers and computers. To meet
the 80 PLUS standard, the power supply must have an efficiency of 80% or greater, at 20%, 50%, and
100% of rated load with PF of .09 or greater. The standard has several grades, such as Bronze, Silver,
Gold, and Platinum. More information on 80 PLUS is available at
The chassis allows configurations of power supplies to give N+N or N+1 redundancy. A chassis can
operate on only three power-supply units (PSUs) with no redundancy, but N+1 or N+N is advised. Three
power supplies (or six with N+N redundancy) allow for a balanced three-phase configuration.
All power supply modules are combined into a single power domain within the chassis, which distributes
power to each of the compute nodes, I/O modules, and ancillary components through the Enterprise
Chassis midplane. The midplane is a highly reliable design with no active components. Each power supply
is designed to provide fault isolation and is hot swappable.
In the case of the 2500W supplies, power monitoring of both the DC and AC signals allows the Chassis
Management Module to accurately monitor the power supplies.
The following figure shows the compute node bay numbering (left) and power supply bay numbering
(right).
Figure 10. Power supply bay numbering
The following table shows the number of compute nodes that are supported in the chassis based on the
power supplies used (2100W or 2500W), the number of power supplies installed, and the power
redundancy policy enabled (N+1 or N+N).
Note: 2100W power supplies are now withdrawn from marketing.
In this table, the colors of the cells have the following meaning:
Green cell: Supported with no restrictions as to the number of compute nodes that can be installed
Yellow cell: Supported but with restrictions on the number of compute nodes that can be installed.
Note: These tables assume the chassis is filled with idential compute nodes. For more complex
configurations, use the Power Configurator:
https://support.lenovo.com/documents/LNVO-PWRCONF
Flex System Enterprise Chassis
http://www.80PLUS.org
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