Thermal And Acoustics; Thermal Design; Table 14. Power Supply Efficiency - Dell PowerEdge R220 Technical Manual

Figure 5 highlights the PowerEdge R220 power supply features.
SATA power cables (2)
Dell PSUs have achieved Silver efficiency levels as shown in Table 14.
Form factor Output
Non-redundant 250W AC

Thermal and acoustics

The PowerEdge R220 was designed with the goal to offer a class leading chassis depth all while
meeting the acoustical requirements for office environment.

Thermal design

The system's PWM fan is controlled by the iDRAC. The thermal sensor on front control board senses
the ambient temperature and adjusts the fan speed accordingly. In a normal office environment the
fan spins slower, resulting in low acoustics. The fan RPM begins to ramp up with temperature to
satisfy cooling requirements at higher ambient temperatures, and different system configuration (e.g.
RAID card installation).
Optimized thermal management makes PowerEdge R220 cool and quiet with efficiency
improvements that save energy. Benefiting from a smart cooling thermal control algorithm, R220
can keep both high performance and good acoustics across a wide range of ambient temperatures
(10 °C ~ 35 °C).
25 Dell PowerEdge R220 Technical Guide
Figure 5. PowerEdge R220 power supply
Screw
Table 14. Power supply efficiency
Class
Silver
250W power supply
ATX power supply
connector (2x12)
Power supply
connector (2x4)
Optical drive cable
Minimum efficiency by load
10% 20%
N/A 85.0%
50% 100%
88.0% 85.0%