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User-configurable settings: An R520 thermal control design target is to minimize the

contribution of fan power to overall system power. However, with the understanding and

realization that every customer has a unique set of circumstances or expectations of the system,

in this generation of servers, we are introducing limited user-configurable settings in the iDRAC7

BIOS setup screen. For more information, see the

Manual

Support.Dell.com/Manuals

Environments and Power Goals" on Dell.com.



Fan fault tolerance: Continuous operation with one motor failure in the system. The R520 base

configuration has four fans. An additional fan (Fan 1) is required if redundant power supplies are

used, and another fan is required if a second processor is used (Fan 6). R520 supports fan fault

tolerance for all six fans.



Cooling redundancy: The R520 allows continuous operation with a fan failure in the system. The

base configuration of the R520 has four fans. Additional fans are needed when using redundant

power supplies and a second processor. The R520 supports fault-tolerant cooling for all six fans.



Environmental specifications: The optimized thermal management makes the R520 reliable

under a wide range of operating environments as shown in the environmental specifications in

Table 25. Many configurations are also compliant under expanded operating temperature

environments, but a few are not.

The acoustical design of the PowerEdge R520 reflects the following:



Versatility: The PowerEdge R520 saves you power draw in the data center, but it also is quiet

enough for the office environment in typical and minimum configurations. Compare the values

for LpA in Table 17 for these configurations, and note that they are lower than ambient

measurements of typical office environments.



Adherence to Dell's high sound quality standards: Sound quality is different from sound power

level and sound pressure level in that it describes how humans respond to annoyances in sound,

like whistles and hums. One of the sound quality metrics in the Dell specification is prominence

ratio of a tone, which is listed in Table 17.



Noise ramp and descent during bootup from power off: Fan speeds and noise levels ramp

during the boot process (from power off to power on) in order to add a layer of protection for

component cooling in the case that the system were not to boot properly. To keep bootup as

quiet as possible, the fan speed reached during bootup is limited to about half of full speed.



Noise level dependencies: If acoustics is important to you, you may want to make the following

configuration choices and settings for the PowerEdge R520 for quieter operation:

In the BIOS, select the power-optimized DAPC rather than performance-optimized for the

system thermal profile

Turn hot spare feature off in PSU

Since hard drive noise is highly dependent on spindle speed, the 7200-rpm SATA hard drive

will have the quietest hard drive operation

However, some components cause significant but not necessarily intuitive increases in loudness

when they are installed in the R520. Contributors to acoustical output can include:

More than one processor

Number of DIMMs

PERC H710 mini, PERC H710P mini, or PERC H810

Dell PowerEdge R520 Systems Owner's

and "Advanced Thermal Control: Optimizing across