Dell PowerEdge T420 - Thermal and Acoustics; Table 17. Power Supply Efficiency; Figure 8. 750 W Power Supply Unit

30 PowerEdge T420 Technical Guide
Figure 8 shows a 750W power supply unit extended from the T420 chassis.
Figure 8. 750W power supply unit
The PowerEdge T420 supports up to two PSUs with 1+1 redundancy, auto-sensing, and
auto-switching capability. The T420 also supports PSU 2+0 configurations for configurations that
exceed the output of a single PSU; in this case, 1+1 redundancy is not supported. Use the Dell
Energy Smart Solution Advisor at Dell.com/ESSA to help you configure your system optimal power
performance.
Dell PSUs have achieved Platinum efficiency levels as shown in Table 17.
Table 17. Power supply efficiency
Form factor
Output
Class
Efficiency targets by load
10%
20%
50%
100%
Redundant 86mm
495W AC
Platinum
82.0%
90.0%
94.0%
91.0%
750W AC
Platinum
82.0%
90.0%
94.0%
91.0%
1100W AC
Platinum
89.0%
93.0%
94.5%
92.0%
Non-redundant
550W AC
Silver
N/A
85.0%
88.0%
85.0%
Thermal and acoustics
Optimized thermal management makes the PowerEdge T420 cool and quiet. Benefiting from smart
cooling fan speed control, the T420 can keep both high performance and good acoustics across a
wide range of ambient temperatures from 10°C to 35°C (50°F to 95°F) and to extended ambient
temperature ranges (see Table 26). Operating environments for the T420 can vary from the data
center to general-use spaces. In a typical configuration, the T420 is suitable for an open office
environment.
Thermal design
The thermal design of the PowerEdge T420 reflects the following: