Dell PowerEdge M910 Manual técnico - Página 17

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Acoustics

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, such as

whistles, hums, etc. One of the sound quality metrics in the Dell specification is prominence ratio of

a tone, as listed in the table below.

Acoustical performance of typical configuration: When installed in the M1000e blade chassis,

typical configuration (shown in Table 4) of M910 blade results in the following idle acoustical

performance in 23±2°C ambient:

Table 4.

Definitions:



Standby: AC power is connected to power supply units but system is not turned on.



Idle: Reference ISO 7779 (1999) definition 3.1.7; system is running in its OS but no other specific

activity.



Stressed processor: An operating mode per ISO 7779 (1999) definition 3.1.6. The software

SPECPower_ssj2008 is utilized to stress the processors. SPECPower is set to 50 percent loading.



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

ISO 7779 (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 ISO 7779 (1999) Section 8.6.2.

PowerEdge M910 Technical Guide

LwA–UL = 8.1 bels and no prominent tones

Typical configuration used in acoustical testing

Chassis

Description

Blade

M910

Slots populated

1, 2, 3, 4

Power supply

2300-W

Blanks

Blank modules

System Fans

M1000e fan

Blade internals

Description

Intel Xeon processor 7500

CPU

series 105W

DIMM

4GB DDR3

Mezz Cards

Dual-port Broadcom 5709

HDD

SAS 2.5" 146GB, 10krpm

Quantity