Dell External OEMR XL R720XD Technical Manual page 38

The quantity and type of PCIe cards installed: This affects overall system acoustics.
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Installation of more than two PCIe cards results in an increase in overall system acoustics.
Utilization of a GPU card: This results in an increase in overall system acoustics.
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PCIe controller-based SSD drives: Drives such as Express flash drives and Fusion-io
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cards require greater airflow for cooling, and result in significantly higher noise levels.
Systems with an H310 PERC: This configuration may be quieter than those with an H710
>
PERC with battery backup. However, higher noise levels result when a system is
configured as non-RAID.
Hot spare feature of power supply unit: In the system default setting, the Hot Spare
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Feature 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.
Configuration
(23 ± 2°C CPUs
ambient)
Minimum 1
Typical 2
Configuration
(23 ± 2°C CPUs
ambient)
Minimum 1
Typical 2
1
LwA – UL is the upper limit sound power levels (LwA) calculated per section 4.4.1 of ISO 9296 (1988) and measured in
accordance to ISO 7779 (2010).
2
LpA is the average A-weighted sound pressure level from the four bystander positions calculated per section 4.3 of
ISO9296 (1988) and measured in accordance with ISO7779 (2010). The system is placed in a half rack enclosure (base of
system is 25 cm above reflective floor).
3
Prominent tone: Criteria of D.6 and D.11 of ECMA-74 11th ed. (2010) are followed to determine if discrete tones are
prominent. The system is placed in a half rack enclosure (base of system is 75 cm above reflective floor) and acoustic
transducer is at front bystander position, ref ISO7779 (2010 Section 8.6.2).
4
Idle: Reference ISO7779 (2010) definition 3.1.7; system is running in its OS but no other specific activity.
5
Stressed processor: An operating mode per ISO7779 (2010) definition 3.1.6. The software SPECPower at 50% loading is
activated to stress the processors.
For more information on Dell's acoustical design, see the
PowerEdge R720 and R720xd Technical Guide
38
Power
Hard drives supply Memory
unit
1 x 250GB 1 x
SATA (7.2k) 495W
6 x 300GB 2 x
SAS (10K) 750W
Power
Hard drives supply Memory
unit
1 x 250GB 1 x
SATA (7.2k) 495W
14 x 300GB 2 x
SAS (10K) 750W
PCI
Operating
card/HDD
mode
controller
1 x 1 x PERC
8GB H310
Stressed
1 x PERC
8 x H710,
8GB 1 x GbE
Stressed
NIC
PCI
Operating
card/HDD
mode
controller
Idle
1 x 1 x PERC
8GB H310
Stressed
1 x PERC
Idle
8 x H710,
8GB 1 x GbE
Stressed
NIC
Dell Enterprise Acoustics
1 2
L -UL L
WA pA
(bels) (dBA)
Idle 4.0 20
4
4.1 20
Idle 4.4 25
4
4.5 26
1 2
L -UL L
WA pA
(bels) (dBA)
4
4.7 28
5
4.8 28
4
4.8 28
5
5.0 30
white paper.
®
Prominent
3
tones
None
None
None
None
Prominent
3
tones
None
None
None
None