Dell EMC PowerEdge T440 - Thermal and Acoustics; Power Supply Units; Acoustical Design; Table 14. Acoustical Reference Points and Output Comparisons

control of fan speed optimizes the thermal settings for your environment to reduce fan
consumption and lower system power consumption.
Thermal and Acoustics
The system's thermal management delivers high performance through optimized cooling of 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.
These optimizations result in lower fan power consumption which translate to lower system power and data center power
consumption.
Power supply units
Energy Smart power supplies have intelligent features, such as the ability to dynamically optimize eciency while maintaining
availability and redundancy. Also featured are enhanced power-consumption reduction technologies, such as high-eciency power
conversion and advanced thermal-management techniques, and embedded power-management features including high-accuracy
power monitoring.
The system supports two hot-swappable AC power supplies with 1 + 1 redundancy, auto-sensing and auto-switching capability.
Acoustical design
Dell EMC 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 EMC 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 the following table. An extensive description of Dell EMC Enterprise acoustical design and metrics is
available in the Dell Enterprise Acoustics white paper.
Table 14. 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 oce layout, normal living room
35 2 Quiet oce
30 1 Quiet library
20 0 Recording studio
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