Power, Thermal, And Acoustics; Power Supply Units; Power Supply Efficiency - Dell EMC PowerEdge R740xd2 Manual

Power, thermal, and acoustics

Power supply units

Energy Smart power supplies have intelligent features, such as the ability to dynamically optimize efficiency while maintaining
availability and redundancy. Also featured are enhanced power- consumption reduction technologies, such as high- efficiency power
conversion and advanced thermal- management techniques, and embedded power- management features, including high- accuracy
power monitoring.
The following table shows the available power supplies for the PowerEdge R740xd2:
Wattage
750W- WRAC
750W HVDC/WRAC
1100W WRAC
1100W HVDC/WRAC
The PowerEdge R740xd2 supports up to 2 AC or DC power supplies with 1+1 redundancy, auto sensing, and auto-switching
capability.
If two PSUs are present during POST, a comparison is made between the wattage capacities of the PSUs. In the event that the PSU
wattages don't match, the larger of the two PSU's is enabled. Also, there is a PSU mismatch warning displayed in BIOS, iDRAC, or on
the System LCD.
If a second PSU is added at run-time, in order for that particular PSU to be enabled, the wattage capacity of the first PSU must
equal the second PSU. Otherwise, the PSU will be flagged as unmatched in iDRAC and the second PSU will not be enabled.

Power supply efficiency

Dell EMC power supplies have achieved Platinum and Titanium efficiency levels as shown in the table below:
Table 6. PSU efficiency levels
Form factor Output
Redundant 86 750W AC
mm
1100W AC
1100W AC
380V
750W
HVDC
NOTE: 750W & 1100W HVDC power supplies are only available in China
Frequency
50/60Hz
50/60Hz
Class
Platinum
Platinum
Platinum
Platinum
Voltage
115/230 VAC
240VDC
115/230 VAC
380V
10%
82.00%
89.00%
90.00%
82.00%
Class
Platinum
Platinum
Platinum
Platinum
20% 50%
90.00% 94.00%
93.00% 94.50%
93.50% 95.00%
90.00% 94.00%
9
Heat dissipation
2891 BTU/hr
2902 BTU/hr
4100 BTU/hr
4100 BTU/hr
100%
91.00%
92.00%
93.00%
91.00%
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