Dell T420 Specifications download pdf (Page 31)

31 PowerEdge T420 Technical Guide

 Multiple sensors are monitored for thermal feedback control: The PowerEdge T420

dynamically controls system cooling fan speed based on responses from component

temperature sensors, including processors, hard disk drives, DIMMs, storage cards, and the inlet

ambient temperature. Thermal control detects and responds to hardware configuration. Thermal

management adjusts cooling according to what the system really needs, draws lower fan power

and generates lower acoustical noise levels than servers without such controls.

 Environmental specifications: The optimized thermal management makes the T420 reliable

under a wide range of operating environments as shown in the environmental specifications in

Table 26. Many configurations are also compliant under expanded operating temperature

environments, but a few are not.

Acoustical design

The acoustical design of the PowerEdge T420 reflects the following:

 Quiet library acoustics: The PowerEdge T420 is quiet enough for an office setting when

minimally configured and for the office under the desk with a typical configuration.

 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, and so on. One of the sound quality metrics in the Dell specification is

prominence ratio of a tone, which is listed in Table 18.

 Configurable for low acoustics: The following are configuration considerations you should make

if acoustics are important to you:

— Storage devices:

> Because hard drive noise scales with spindle speed, the quietest option for rotational

storage media is a 7200-rpm SATA drive. The loudest option is a 15k SAS drive.

> Solid-state drives are even quieter than rotational drives because they have no sound

associated with spinning.

> Noise levels increase with the quantity of hard drives; using fewer hard drives has a lower

acoustical output.

— Impact of cards:

> Quantity of PCIe cards: When more than two PCIe cards are installed, the system fan

speed/noise level is higher.

> Types of PCIe cards: The fan speed/noise level is higher if a GPU and PERC H710 are

installed.

— System Profile settings in BIOS and Thermal settings in iDRAC: Performance Per Watt is the

quietest option. Other options such as Performance Optimized or Dense Configuration

require higher fan speeds, which produce higher acoustic levels.

— Hot spare feature of power supply unit: In system default setting, the hot spare feature is

disabled; acoustical output from the power supplies is lowest in this setting. If the feature is

enabled and the system power loading is low, the power supply fan speed, hence noise, is

higher.

— RAID Setup with PERC H310: A system configured as non-RAID has a higher noise level than

a system configured as RAID. With non-RAID, the temperature of the hard disk drives is not

monitored, which causes the fan speed to be higher to ensure sufficient cooling resulting in

higher noise level.

 Noise ramp and descent during bootup from power off: Fan speed noise levels ramp during the

boot process (from power off to power on) to add a layer of protection for component cooling in

case the system does not boot properly. To keep the bootup process as quiet as possible, the fan

speed reached during bootup is limited to about half of full speed.

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Dell T420 Specifications Page 31

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