Dell PowerEdge R720 Technical Manual

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Dell PowerEdge R720 Technical Manual Manual pdf 42 page image

42 PowerEdge R720 and R720xd Technical Guide> Hot spare feature of power supply unit: In the system default setting, the Hot SpareFeature is disabled; acoustical output from the power supplies is lowest in this setting.Table 21 and Table 22 detail the acoustical performance for the R720 and R720xd.Table 21. R720 acoustical performance (2.5-inch chassis)Configuration(23 ± 2°Cambient)CPUs Hard drivesPowersupplyunitMemoryPCIcard/HDDcontrollerOperatingmodeLWA-UL1(bels)LpA2(dBA)Prominenttones3Minimum 1 1 x 250GBSATA (7.2k)1 x495W1 x8GB1 x PERCH310Idle 4.0 20 NoneStressed4 4.1 20 NoneTypical 2 6 x 300GBSAS (10K)2 x750W8 x8GB1 x PERCH710,1 x GbENICIdle 4.4 25 NoneStressed4 4.5 26 NoneTable 22. R720xd acoustical performance (2.5-inch chassis)Configuration(23 ± 2°Cambient)CPUs Hard drivesPowersupplyunitMemoryPCIcard/HDDcontrollerOperatingmodeLWA-UL1(bels)LpA2(dBA)Prominenttones3Minimum 1 1 x 250GBSATA (7.2k)1 x495W1 x8GB1 x PERCH310Idle4 4.7 28 NoneStressed5 4.8 28 NoneTypical 2 14 x 300GBSAS (10K)2 x750W8 x8GB1 x PERCH710,1 x GbENICIdle4 4.8 28 NoneStressed5 5.0 30 None1LwA – UL is the upper limit sound power levels (LwA) calculated per section 4.4.1 of ISO 9296 (1988) and measured inaccordance to ISO 7779 (2010).2LpA is the average A-weighted sound pressure level from the four bystander positions calculated per section 4.3 ofISO9296 (1988) and measured in accordance with ISO 7779 (2010). The system is placed in a half rack enclosure (base ofsystem is 25 cm above reflective floor).3Prominent tone: Criteria of D.6 and D.11 of ECMA-74 11th ed. (2010) are followed to determine if discrete tones areprominent. The system is placed in a half rack enclosure (base of system is 75 cm above reflective floor) and acoustictransducer is at front bystander position, ref ISO 7779 (2010 Section 8.6.2).4Idle: Reference ISO 7779 (2010) definition 3.1.7; system is running in its OS but no other specific activity.5Stressed processor: An operating mode per ISO 7779 (2010) definition 3.1.6. The software SPECPower at 50% loading isactivated to stress the processors.For more information on Dell’s acoustical design, see the Dell Enterprise Acoustics white paper.