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Dell EMC PowerEdge R440 Installation and Service Manual

Power supply units

NOTE For more information, see the PowerEdge R440 Technical Specs at www.dell.com/poweredgemanuals.
CAUTION If two PSUs are installed, both the PSUs must have the same type of label. For example, Extended Power Performance (EPP) label. Mixing PSUs from previous generations of PowerEdge servers is not supported, even if the PSUs have the same power rating. Mixing PSUs will result in mismatch condition or failure to turn the system on.
NOTE When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy or 2+0 – without redundancy) is configured in system BIOS. In redundant mode, power is supplied to the system equally from both PSUs when Hot Spare is disabled. When Hot Spare is enabled, one of the PSUs is put into the sleep mode when system utilization is low in order to maximize efficiency.
NOTE If two PSUs are used, they must be of the same maximum output power.

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