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Table 3-10 Power efficiencies at different load levels
80 PLUS Platinum standard
NeXtScale n1200 900 W power supply
NeXtScale n1200 1300 W power supply
The 80 PLUS performance specification is for power supplies that are 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 0.9 or greater. The standard has several grades, such as, Bronze,
Silver, Gold, and Platinum. For more information about the 80 PLUS standard,
see this website:
http://www.80PLUS.org
The power supplies receive electrical power from a 100 V - 127 V AC or 200 v -
240 V AC power source and convert the AC input into DC outputs. The power
supplies can autorange within the input voltage range.
Use with 110-127 V AC: When low input voltage (100 V - 127 V AC) is used,
the power supply is limited to 600 W.
There is one common power domain for the chassis that distributes DC power to
each of the nodes and modules through the system midplane.
DC redundancy is achieved when there is one more power supply available than
is needed to provide full power to all chassis components. AC redundancy is
achieved by distributing the AC power cord connections between independent
AC circuits. For more information, see 5.1, "Power planning" on page 116.
Each power supply includes presence circuitry, which is powered by the
midplane. This allows the FPC to recognize when power supplies are installed in
the enclosure but are not powered by the AC supply.
The power supplies support oversubscription. By using oversubscription, users
can make the most of the extra power from the redundant power supplies when
the power supplies are in healthy condition. This means you can use the power
capacity of all installed power supplies while still preserving power supply
redundancy if there is a power supply failure. For more information, see "Power
supply oversubscription" on page 54.
40
IBM NeXtScale System Planning and Implementation Guide
20% load
50% load
90.00%
94.00%
92.96%
94.15%
93.97%
94.54%
100% load
91.00%
92.53%
92.65%
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