Acoustics; Section 4. Block Diagram - Dell PowerEdge M710 Technical Manualbook

Dell™ PowerEdge™ M710 Technical Guidebook
b. acoustics
The acoustical design of the PowerEdge M710 reflects the following:
• A dherence 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, hums, etc. One of the sound quality metrics in the Dell specification is prominence
ratio of a tone, and this is listed in the table below.
• H ardware configurations and types of applications affect system noise levels. Dell's advanced
thermal control provides for optimized cooling with varying hardware configurations and
component utilizations. Most typical configurations will perform as listed in the table below.
However some less typical configurations and components can result in higher noise levels.
Higher application loads, e.g., CPU utilization, can also result in higher noise levels.
PowerEdge M710 typically configured blade in an m1000e chassis
Condition in 23 + _ 2° C ambient
Idle
Definitions
Idle: Reference ISO7779 (1999) definition 3.1.7; system is running in its OS but no other specific activity.
LwA-UL: The upper limit sound power level (LwA) calculated per section 4.4.2 of ISO 9296 (1988) and
measured in accordance with ISO7779 (1999).
Tones: Criteria of D.5 and D.8 of ECMA-74 9th ed. (2005) are followed to determine if discrete tones are
prominent. The system is placed in a rack with its bottom at 75 cm from the floor. The acoustic
transducer is at front bystander position, ref ISO7779 (1999), Section 8.6.2.

sectiOn 4. blOck DiaGRaM

LwA-UL, bels
7.4
Tones
No prominent tones
11