Dell R210 manual Acoustics, Definitions

Dell

•Optimized Ventilation. R210 chassis has a custom ventilation design for optimized air flow path. Each component and peripheral is ensured sufficient air to cool.

•Power-to-Cool.Dell continues to improve the design and cooling efficiency for server products. The power-to-cool ratio of the PowerEdge R210 is improved over that of its predecessor, PowerEdge R200.

5.7Acoustics

The acoustical design of the PowerEdge R210 reflects the following:

•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, as listed in the table below.

•Noise ramp and descent at bootup. Fan speeds, hence noise levels, ramp during the boot process in order to add a layer of protection for component cooling in case the system were not to boot properly.

•Noise levels vs. configurations. The noise level of PowerEdge R210 is not dependent upon the hardware configuration of the system. The table below shows the noise levels of the PowerEdge R210 with maximum configuration.

					Table 11.		Acoustical Specifications
			Configurations @ 23 ± 2 °C					Operating	LWA-UL	LpA	PROMINENT
CPU				DIMM		ODD	HDD	Mode	(Bels)	(dBA)	TONES
								Standby	2.8	16	None
®	Xeon	®					4 x 3.5” SAS
Intel						1 X DVD+/-		Idle	6.5	49	None
X3450 2.66				4 x 4GB			(450 GB/
						RW
GHz
							15000 RPM)
								Stressed	6.5	49	None
								Processor

Definitions

Standby: AC Power is connected to Power Supply Units but system is not turned on.

Idle: Reference ISO7779 (1999) definition 3.1.7; system is running in its OS but no other specific activity.

Stressed Processor: An operating mode per ISO7779 (1999) definition 3.1.6. The software MemBW4 is activated to stress the processors.

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: A-Weighted sound pressure level. The system is placed in a rack with its bottom at 75 cm from the floor. The acoustic transducer is at front bystander position, ref ISO7779 (1999) Section 8.6.2.

Prominent 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

PowerEdge R210 Technical Guide 29