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Power, thermal, and acoustics
Power supply units
Energy Smart power supplies have intelligent features, such as the ability to dynamically optimize eciency while maintaining
availability and redundancy. Also featured are enhanced power- consumption reduction technologies, such as high- eciency 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 Frequency Voltage Class Heat dissipation
750W- WRAC 50/60Hz 115/230 VAC Platinum 2891 BTU/hr
750W HVDC/WRAC 240VDC Platinum 2902 BTU/hr
1100W WRAC 50/60Hz 115/230 VAC Platinum 4100 BTU/hr
1100W HVDC/WRAC 380V Platinum 4100 BTU/hr
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 rst PSU must
equal the second PSU. Otherwise, the PSU will be agged as unmatched in iDRAC and the second PSU will not be enabled.
Power supply eciency
Dell EMC power supplies have achieved Platinum and Titanium eciency levels as shown in the table below:
Table 6. PSU eciency levels
Form factor Output Class 10% 20% 50% 100%
Redundant 86
mm
750W AC Platinum 82.00% 90.00% 94.00% 91.00%
1100W AC Platinum 89.00% 93.00% 94.50% 92.00%
1100W AC
380V
Platinum 90.00% 93.50% 95.00% 93.00%
750W
HVDC
Platinum 82.00% 90.00% 94.00% 91.00%
NOTE: 750W & 1100W HVDC power supplies are only available in China
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