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25 Dell PowerEdge R220 Technical Guide

Figure 5 highlights the PowerEdge R220 power supply features.

PowerEdge R220 power supply Figure 5.

Dell PSUs have achieved Silver efficiency levels as shown in Table 14.

Power supply efficiency

Table 14.

Form factor

Output

Class

Minimum efficiency by load

10%

20%

50%

100%

Non-redundant

250W AC

Silver

N/A

85.0%

88.0%

85.0%

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).

Screw

250W power supply

ATX power supply

connector (2x12)

Power supply

connector (2x4)

Optical drive cable

SATA power cables (2)

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Dell R220 Spécifications Page 25