Dell PowerEdge R630 - Acoustical Design; Table 22. Acoustical Reference Points and Output Comparisons; Thermal Design

36 PowerEdge R630 Technical Guide
Thermal design
The thermal design of the PowerEdge R630 reflects 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 minimal expense of fan power.
 Comprehensive thermal management: The thermal control system regulates the system fan
speeds based on feedback from system component temperature sensors, as well as for system
inventory and subsystem power draw. Temperature monitoring includes components such as
processors, DIMMs, chipset, system inlet air temperature, hard disk drives, NDC and GPU.
 Open and closed loop fan speed control: Open loop fan control uses system configuration to
determine fan speed based on system inlet air temperature. Closed loop thermal control uses
temperature feedback to dynamically adjust fan speeds based on system activity and cooling
requirements.
 User-configurable settings: With the understanding and realization that every customer has a
unique set of circumstances or expectations from the system, in this generation of servers, we
have introduced limited user-configurable settings in the iDRAC8 BIOS setup screen. For more
information, see the Dell PowerEdge R630 Owner’s Manual on Dell.com/Support/Manuals and
“Advanced Thermal Control: Optimizing across Environments and Power Goals” on Dell.com.
 Cooling redundancy: The R630 allows N+1 fan redundancy, allowing continuous operation with
one fan failure in the system.
Acoustical design
Dell focuses on sound quality in addition to sound power level and sound pressure level. Sound
quality describes how disturbing or pleasing a sound is interpreted, and Dell references a number of
psychacoustical metrics and thresholds in delivering to it. Tone prominence is one such metric.
Sound power and sound pressure levels increase with greater populations or higher utilization, while
sound quality remains good even as the frequency content changes. A reference for comparison to
sound pressure levels for familiar noise sources is given in Table 22. An extensive description of Dell
Enterprise acoustical design and metrics is available in the Dell Enterprise Acoustics white paper.
Table 22. Acoustical reference points and output comparisons
Value measured at your ears
Equivalent familiar noise experience
LpA, dBA, re
20 µPa
Loudness,
sones
90
80
Loud concert
75
39
Data center, vacuum cleaner, voice must be elevated to be heard
60
10
Conversation levels
45
4
Whispering, open office layout, normal living room
35
2
Quiet office
30
1
Quiet library
20
0
Recording studio