Dell External OEMR XL R720XD Technical Manual page 36

Figure 13 shows a 750W power supply unit extended from an R720 system.
The PowerEdge R720 and R720xd support up to two AC or DC power supplies with 1 + 1
redundancy, auto sensing, and auto-switching capability.
Dell PSUs have achieved Platinum efficiency levels as shown in Table 20.
Form factor
495W
750W
Redundant 86mm
1100W
1100W DC
1
1100W DC power supply available Q2 2012.
Thermal management of PowerEdge R720 and R720xd delivers high performance for the right
amount of cooling to components at the lowest fan speeds 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 32) . The benefits to you are lower fan power consumption (lower server system power and
data center power consumption) and greater acoustical versatility. The PowerEdge R720 is quiet
enough to be used in an office environment in typical and minimum configurations, and the R720xd
can also operate at a similar level in certain configurations.
The thermal design of the PowerEdge R720 and R720xd reflect the following:
 Optimized thermal design: The system layout is architected for optimum thermal design.
System component placement and layout are designed to provide maximum airflow coverage to
critical components with minimum expense of fan power.
PowerEdge R720 and R720xd Technical Guide
36
Output Class
Platinum
Platinum
Platinum+
1
Gold
Efficiency targets by load
10% 20%
82.0% 90.0%
82.0% 90.0%
89.0% 93.0%
80.0% 88.0%
50% 100%
94.0% 91.0%
94.0% 91.0%
94.5% 92.0%
92.0% 88.0%