Acoustics; Acoustical Performance For 4-Socket Configuration - Dell PowerEdge R815 Technical Manual

Dell
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.
4-Socket Configuration @
CPU
4x 6400 MT
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.
Dell PowerEdge R815 Technical Guide

Acoustical Performance for 4-Socket Configuration

°C
23 ± 2
HDD RAID
4x 15 krpm PERC
SAS H700
L
Operating
UL
Mode
DIMM
(Bels)
Idle 5.6
32x
SPEC 50% 5.6
4GB
DDR3
HDD
5.6
active
-
WA
L Prominent
pA
(dBA) Tones
41 None
41 None
41 None
23