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

Figure 8 shows a 750W power supply unit extended from the T420 chassis.
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.
Energy Smart Solution Advisor at
performance.
Dell PSUs have achieved Platinum efficiency levels as shown in Table 17.
Form factor Output
495W AC
Redundant 86mm 750W AC
1100W AC
Non-redundant 550W AC

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:
30 PowerEdge T420 Technical Guide
Figure 8. 750W power supply unit
Dell.com/ESSA to help you configure your system optimal power
Table 17. Power supply efficiency
Class
Platinum
Platinum
Platinum
Silver
Efficiency targets by load
10% 20%
82.0% 90.0%
82.0% 90.0%
89.0% 93.0%
N/A 85.0%
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50% 100%
94.0% 91.0%
94.0% 91.0%
94.5% 92.0%
88.0% 85.0%