Acoustics; Typical Configuration Used In Acoustical Testing - Dell PowerEdge M910 Technical Manual

Dell

5.2 Acoustics

Adherence to Dell's high sound quality standards.
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.
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 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.
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.
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
CPU
series 105W
DIMM 4 GB DDR3
Mezz Cards Dual-port Broadcom
HDD SAS 2.5‖ 146 GB, 10 krpm
Sound quality is different from sound power level
® ®
Xeon processor 7500
®
5709
Quantity
4
6
8
9
Quantity
2
24
4
2
18