Dell M910 manual Acoustics, Typical Configuration Used in Testing

Dell

5.2 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, 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 configuration2 (shown in Table 4of M910 blade results in the following idle acoustical performance in 23±2° C ambient:

LwA-UL3= 8.1 bels and no prominent tones4

Table 4. Typical Configuration Used in Testing

Chassis		Description	Quantity
Blade		M910	4
Slots populated	1, 2, 3, 4
Power supply		2300-W	6
Blanks		Blank modules	8
System Fans		M1000e fan	9
Blade Internals		Description	Quantity
CPU		Intel® Xeon® processor 7500	2
		series 105W
DIMM		4 GB DDR3	24
Mezz Cards		Dual-port Broadcom® 5709	4
HDD		SAS 2.5‖ 146 GB, 10 krpm	2

2Typical configuration means projected average quantity, type, capacity, speed, etc., of components. Configuration for which data reported is listed in Table 4.

3LwA – UL is 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).

4Prominent 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 acoustical transducer is at front bystander position, ref ISO7779 (1999) Section 8.6.2.

Dell PowerEdge M910 Technical Guide 16