Thermal And Acoustics; Table 22. Power Supply Efficiency; Figure 9. 750W Power Supply Unit - Dell PowerEdge R620 Technical Manual

Figure 9 shows a 750W power supply unit extended from the R620 chassis.
The PowerEdge R620 supports up to two AC or DC power supplies with 1 + 1 redundancy,
auto-sensing, and auto-switching capability.
Dell power supplies have achieved Titanium efficiency levels as shown in Table 22.
Form factor Output
495W AC
750W AC
Redundant 86mm 750W AC
1100W AC
1100W DC

Thermal and acoustics

Optimized thermal management makes the PowerEdge R620 cool and quiet. Benefiting from smart
cooling fan speed control, the R620 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 33). Operating environments for the R620 can vary from the data
center to general-use spaces. In typical and minimum configurations, the R620 is quiet enough to
be used in an office environment.
Thermal design
The thermal design of the PowerEdge R620 reflects the following:

Multiple sensors are monitored for thermal feedback control: The PowerEdge R620
dynamically controls system cooling fan speed based on responses from all component
temperature sensors, including processors, hard disk drives, DIMMs, storage cards and the inlet
ambient temperature. Thermal control detects and responds to hardware configuration. Thermal
35 PowerEdge R620 Technical Guide
Figure 9. 750W power supply unit
Table 22. Power supply efficiency
Class
Platinum
Titanium
Platinum
Platinum
N/A
Efficiency targets by load
10% 20%
82.0% 90.0%
90.0% 94.0%
82.0% 90.0%
89.0% 93.0%
80.0% 88.0%
50% 100%
94.0% 91.0%
96.0% 91.0%
94.0% 91.0%
94.5% 92.0%
91.0% 88.0%