Dell H810 Specifikace stáhnout pdf (Strana 40)

40 PowerEdge R720 and R720xd Technical Guide

> Using a GPU card: This results in an increase in overall system acoustics.

> PCIe controller-based SSD drives: Drives such as Express flash drives and Fusion-io 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

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

ambient)

CPUs

Hard drives

Power

supply

unit

Memory

PCI

card/HDD

controller

Operating

mode

LWA-

UL1

(bels)

LpA2

(dBA)

Prominent

tones3

Minimum

1 x 250GB

SATA (7.2k)

1 x

495W

1 x

8GB

1 x PERC

H310

Idle

4.0

None

Stressed

4.1

None

Typical

6 x 300GB

SAS (10K)

2 x

750W

8 x

8GB

1 x PERC

H710,

1 x GbE

NIC

Idle

4.4

None

Stressed

4.5

None

Configuration

(23 ± 2°C

ambient)

CPUs

Hard drives

Power

supply

unit

Memory

PCI

card/HDD

controller

Operating

mode

-UL

(bels)

(dBA)

Prominent

tones

Minimum

1 x 250GB

SATA (7.2k)

1 x

495W

1 x

8GB

1 x PERC

H310

Idle

4.7

None

Stressed

4.8

None

Typical

14 x 300GB

SAS (10K)

2 x

750W

8 x

8GB

1 x PERC

H710,

1 x GbE

NIC

Idle

4.8

None

Stressed

5.0

None

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).

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 ISO 7779 (2010). The system is placed in a half rack enclosure (base of

system is 25 cm above reflective floor).

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 ISO 7779 (2010 Section 8.6.2).

Idle: Reference ISO 7779 (2010) definition 3.1.7; system is running in its OS but no other specific activity.

Stressed processor: An operating mode per ISO 7779 (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 Dell Enterprise Acoustics white paper.

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