Dell PowerEdge T20 Technical Manual

Also see for PowerEdge T20: Features Owner's manual Getting started guide Owner's manual Getting started guide

Dell PowerEdge T20 Technical Guide 187 Power, thermal and acousticsLower overall system-level power draw is a result of breakthrough system design. The DellPowerEdge T20 server maximizes performance per watt through a combination of power andcooling, energy-efficient technologies and tools. Additionally, the PowerEdge T20 has an extensivecollection of sensors that automatically track thermal activity, which helps regulate temperature,thereby reducing server noise and power consumption.Power managementTable 14 summarizes power management features on the PowerEdge T20.Table 14. Power management featuresFeature Type Enable/Status/Ctrlbit location DescriptionACPI mode switch Fixed PCH The operating system uses theSCI_EN bit in PCH to switchfrom legacy mode to ACPImode.Sleep states Fixed PCH Supported states: S0 (Working),S4-OS (‘Hibernation’), and S5(Soft-off).S1 (also called ‘standby’ or‘suspend’) and S3 are notsupported.Power button Fixed PCH In ACPI mode, the operatingsystem has control of the powerbutton. In non-ACPI mode, SMIhandler owns power buttonevents.Real-time clock (RTC) Fixed PCH The operating system is able toconfigure the system to wake onthe RTC alarm.Power management timer Fixed PCH PCH 32-bit power managementtimer is used.Power management event(PME)Generic PCH When a device signals PME, thesystem wakes (if necessary), theOS detects the event, and a Dell-defined ASL routine handles theevent. Wake-on-LAN is oneexample of a PME.DBS N/A Processor MSRs This feature does P statetransition under Windows.C state support N/A Processor and PCHregistersThis feature allows multiple Cstate support for the processor.This feature will work underWindows and ACPI OS thatunderstand C states.