Dell PowerEdge R815 Specifications download pdf (Page 24)

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Dell PowerEdge R815 Technical Guide

4.8 Acoustics

The acoustical design of the PowerEdge R815 reflects 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, hums, etc. One of the sound quality metrics in the Dell specification is

prominence ratio of a tone as shown in Table 6.

Table 6. Acoustical Performance for 4-Socket Configuration

4-Socket Configuration @ 23 ± 2 °C

Operating

Mode

(Bels)

(dBA)

Prominent

Tones

CPU

HDD

RAID

DIMM

4x 6400 MT

4x 15 krpm

SAS

PERC

H700

32x

4GB

DDR3

Idle

5.6

None

SPEC 50%

5.6

None

HDD

active

5.6

None

Definitions

Idle: Reference ISO7779 (1999) definition 3.1.7; system is running in its OS but no

other specific activity.

Stressed Processor: An operating mode per ISO7779 (1999) definition 3.1.6. The

software SPECPower_ssj2008 is utilized to stress the processors. SPECPower is set to

50% loading.

HDD Active: An operating mode per ISO7779 (1999) definition 3.1.6. The software

IOMeter is utilized to stress the installed HDDs. IOMeter is running ECMA-74 active

mode.

LwA – UL: The upper limit sound power level (LwA) calculated per section 4.4.2 of ISO

9296 (1988) and measured in accordance to ISO 7779 (1999).

LpA: Average bystander A-Weighted sound pressure level. The system is placed in a

rack with its bottom at 25 cm from the floor. The acoustic transducers are at the four

bystander positions, ref ISO7779 (1999) Section 8.6.2.

Prominent tone: 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.

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