Dell PowerEdge T20 Manuale tecnico - Pagina 19

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Power, thermal and acoustics

Lower overall system-level power draw is a result of breakthrough system design. The Dell

PowerEdge T20 server maximizes performance per watt through a combination of power and

cooling, energy-efficient technologies and tools. Additionally, the PowerEdge T20 has an extensive

collection of sensors that automatically track thermal activity, which helps regulate temperature,

thereby reducing server noise and power consumption.

Power management

Table 14 summarizes power management features on the PowerEdge T20.

Feature

ACPI mode switch

Sleep states

Power button

Real-time clock (RTC)

Power management timer

Power management event

(PME)

DBS

C state support

Dell PowerEdge T20 Technical Guide

Table 14.

Power management features

Enable/Status/Ctrl

Type

bit location

Fixed

PCH

Fixed

PCH

Fixed

PCH

Fixed

PCH

Fixed

PCH

Generic

PCH

N/A

Processor MSRs

N/A

Processor and PCH

registers

Description

The operating system uses the

SCI_EN bit in PCH to switch

from legacy mode to ACPI

mode.

Supported states: S0 (Working),

S4-OS ('Hibernation'), and S5

(Soft-off).

S1 (also called 'standby' or

'suspend') and S3 are not

supported.

In ACPI mode, the operating

system has control of the power

button. In non-ACPI mode, SMI

handler owns power button

events.

The operating system is able to

configure the system to wake on

the RTC alarm.

PCH 32-bit power management

timer is used.

When a device signals PME, the

system wakes (if necessary), the

OS detects the event, and a Dell-

defined ASL routine handles the

event. Wake-on-LAN is one

example of a PME.

This feature does P state

transition under Windows.

This feature allows multiple C

state support for the processor.

This feature will work under

Windows and ACPI OS that

understand C states.