Dell EMC PowerEdge R840 Installation and Service Manual
Power supply units
The power supply unit (PSU) is an internal hardware component which supplies power to the components in the system.
Your system supports one of the following:- Two 2400 W, 2000 W, 1600 W, 1100 W, or 750 W AC PSUs
- Two 750 W DC PSUs (for China only)
- Two 1100 W DC PSUs
- Two 1100 W or 750 W (for China only) Mixed Mode HVDC PSUs
NOTE For more information about power supply units, see the PowerEdge
R840 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 result in mismatch condition or failure to turn on the system.
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 to maximize efficiency.
NOTE If two PSUs are used, they must be of the same maximum output power.
NOTE In a single PSU configuration, install the PSU in bay 1 (bottom PSU slot).
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