Dell PowerEdge M910 Technical Manual

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Dell PowerEdge M910 Technical Manual Manual pdf 17 page image

PowerEdge M910 Technical Guide 17AcousticsAdherence to Dell’s high sound quality standards. Sound quality is different from sound power leveland sound pressure level in that it describes how humans respond to annoyances in sound, such aswhistles, hums, etc. One of the sound quality metrics in the Dell specification is prominence ratio ofa 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 acousticalperformance in 23±2°C ambient:LwA–UL = 8.1 bels and no prominent tonesTable 4. Typical configuration used in acoustical testingChassis Description QuantityBlade M910 4Slots populated 1, 2, 3, 4Power supply 2300-W 6Blanks Blank modules 8System Fans M1000e fan 9Blade internals Description QuantityCPU Intel Xeon processor 7500series 105W 2DIMM 4GB DDR3 24Mezz Cards Dual-port Broadcom 5709 4HDD SAS 2.5” 146GB, 10krpm 2Definitions: 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 specificactivity. Stressed processor: An operating mode per ISO 7779 (1999) definition 3.1.6. The softwareSPECPower_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 itsbottom at 25 cm from the floor. The acoustic transducers are at the four bystander positions, refISO 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 ifdiscrete tones are prominent. The system is placed in a rack with its bottom at 75 cm from thefloor. The acoustic transducer is at front bystander position, ref ISO 7779 (1999) Section 8.6.2.