efficient power consumption in the modern datacenter

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William Hammond Efficient Efficient Power Power Consumption in Consumption in the modern the modern Datacenter Datacenter William A Hammond William A Hammond Senior Technology Planner Senior Technology Planner Digital Enterprise Group Digital Enterprise Group March 1, 2005 March 1, 2005

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William Hammond

Efficient Power Efficient Power Consumption in Consumption in the modern the modern DatacenterDatacenter

William A HammondWilliam A HammondSenior Technology PlannerSenior Technology Planner

Digital Enterprise GroupDigital Enterprise Group

March 1, 2005March 1, 2005

2

William Hammond

Server focused AgendaServer focused Agenda

Power Consumption ReviewPower Consumption Review– Showcase where technology focus can have impactShowcase where technology focus can have impact

Datacenter Modular Power IssuesDatacenter Modular Power Issues IntelIntel®® Power Utilities Power Utilities

– Demand Based Switching to save powerDemand Based Switching to save power– Power Calculator to increase rack utilizationPower Calculator to increase rack utilization– Power Monitor to provide DC wide interactionsPower Monitor to provide DC wide interactions

Power reduction in futurePower reduction in future– Continuous capability and impact in future Continuous capability and impact in future

““Intel, SpeedStep and XEON are trademarks or registered trademarks of Intel Corporation Intel, SpeedStep and XEON are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States or other countries.”or its subsidiaries in the United States or other countries.”

William Hammond

Power Power Consumption Consumption ReviewReview

4

William Hammond ChillerChiller

Condenser Condenser looploop

CoolingCoolingTowerTower

PDU

PDU

PDU

Where the Power Goes – Facility Where the Power Goes – Facility ViewView

AHU

AHU

AHU

GridGrid3-Phase3-Phase

Diesel Backup

Generator

Power Consumption Review

AHU

• 50% incoming DC power consumed in HVAC and 50% incoming DC power consumed in HVAC and Power Delivery subsystems before reaching systemPower Delivery subsystems before reaching system• AHU to Chiller to Tower efficient closed-loop systemsAHU to Chiller to Tower efficient closed-loop systems• Continued analysis of variable efficiency AHU’sContinued analysis of variable efficiency AHU’s

• General over-blowing of DC ambientGeneral over-blowing of DC ambient• Focus on Efficient UPS’sFocus on Efficient UPS’s

UPS’s Transfer

Switch

Panel

5

William Hammond

Where the Power Goes – Platform Where the Power Goes – Platform ViewView

Power Consumption Review

• Remaining 50% DC power consumed in ServersRemaining 50% DC power consumed in Servers• ~ 50% of which is internal AC Conversion & Cooling~ 50% of which is internal AC Conversion & Cooling• ~ 30% is the processors themselves (but 50% leakage)*~ 30% is the processors themselves (but 50% leakage)*

PDU

PDU

PDU

GridGrid3-Phase3-Phase

Panel

DC/DC losses10%

Fans9%

Other44%

Standby2%

Processors30%

AC/DC losses25%

Memory11%

Planar4%

Drives6%PCI

3%

Estimated 670W P/SEstimated 670W P/S

* * System average based on Intel® Dual Processor 1U and 2U reference Server Board Power System average based on Intel® Dual Processor 1U and 2U reference Server Board Power Budgets. Actual end user power profile may vary depending on manufacturer and Budgets. Actual end user power profile may vary depending on manufacturer and

configuration.configuration.

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William Hammond

HVAC, 50%

PS/VRM, 25%

Proc, 15%

Rest, 10%

Power Reduction – Facility ViewPower Reduction – Facility ViewPower Consumption Review

• Critical that Server and building industry come together Critical that Server and building industry come together for operational expense reductionsfor operational expense reductions

• Fast T-rise prohibits sensors aloneFast T-rise prohibits sensors alone• Early warning/feedback from servers keyEarly warning/feedback from servers key

Reduce Over-blowing via predictive heat-

load analysis

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William Hammond

HVAC, 50%

PS/VRM, 25%

Proc, 15%

Rest, 10%

Power Reduction – Platform Power Reduction – Platform ViewView

Power Consumption Review

• Server manufacturers and PS/VRM vendors togetherServer manufacturers and PS/VRM vendors together• Determine optimum efficiency pointsDetermine optimum efficiency points• Investing in new technologies for efficiencyInvesting in new technologies for efficiency

Reduce Over-blowing via predictive heat-

load analysis

Multi-point highly efficient PS/VRM’s, and reduced

number of discrete voltages

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William Hammond

HVAC, 50%

PS/VRM, 25%

Proc, 15%

Rest, 10%

Power Reduction – Processor Power Reduction – Processor ViewView

Power Consumption Review

• IntelIntel is bringing dramatic reductions starting this year is bringing dramatic reductions starting this year• Leakage fraction last years on new 2005 silicon processLeakage fraction last years on new 2005 silicon process• Core power and leakage reductions continue unabatedCore power and leakage reductions continue unabated

Reduce Over-blowing via predictive heat-

load analysis

Multi-point highly efficient PS/VRM’s, and reduced

number of discrete voltages

Remove leakage component, new

adaptive circuits, take advantage of thermal

headroom

* These values are listed by Intel as a convenience to Intel's general customer base, but Intel does not make any representations or warranties whatsoever regarding quality, reliability, functionality, or compatibility of these devices.

This list and/or these devices may be subject to change without notice.

9

William Hammond

HVAC, 50%

PS/VRM, 25%

Proc, 15%

Rest, 10%

Power Reduction – Planar ViewPower Reduction – Planar ViewPower Consumption Review

• IntelIntel technology investments paying off technology investments paying off • DDR2-400 30 to 40% lower power than DDR1-400†DDR2-400 30 to 40% lower power than DDR1-400†• Continued planar component integrationsContinued planar component integrations

Reduce Over-blowing via predictive heat-

load analysis

Multi-point highly efficient PS/VRM’s, and reduced

number of discrete voltages

Remove leakage component, new adaptive circuits

Advanced memory, I/O integration, low-

power drives

†† http://www.elecdesign.com/Articles/Index.cfm?ArticleID=3189&pg=3

10

William Hammond

Power Reduction - SummaryPower Reduction - SummaryPower Consumption Review

• Intel delivering a Intel delivering a holistic platformholistic platform response to impact response to impact all areas of power consumptionall areas of power consumption

Dramatic reduction in processor power consumption Dramatic reduction in processor power consumption • Intel silicon processes and leakage reductionsIntel silicon processes and leakage reductions• Architecture and design carryover from mobile lineArchitecture and design carryover from mobile line

System Level EnhancementsSystem Level Enhancements• High Efficiency Power Supplies and VRM’sHigh Efficiency Power Supplies and VRM’s• Demand Based SwitchingDemand Based Switching

Datacenter Level IntelDatacenter Level Intel®® Power Utilities Power Utilities• Power Calculator – Maximize existing CapExPower Calculator – Maximize existing CapEx• Power Monitor – Minimize ongoing OpExPower Monitor – Minimize ongoing OpEx

William Hammond

Datacenter Datacenter Modular Modular Power IssuesPower Issues

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William Hammond

Today’s Datacenter ProfileToday’s Datacenter Profile While Datacenters (DC) vary considerablyWhile Datacenters (DC) vary considerably

–Almost all utilize air for heat removalAlmost all utilize air for heat removal

–Most new builds are in the 90-135 W/sq.ft.Most new builds are in the 90-135 W/sq.ft.– Approximately 6-10 kW/rackApproximately 6-10 kW/rack

– Most are power-out limited vs. power-in limitedMost are power-out limited vs. power-in limited

– Some rare ones in the 500+ W/sq.ft. (ROI?)Some rare ones in the 500+ W/sq.ft. (ROI?)

–Are large capital 10 year investmentsAre large capital 10 year investments

13

William Hammond

Issue: Rack System Power ProfileIssue: Rack System Power ProfilePCI7%

Drives9%

Planar3%

Memory9%

AC/DC losses25%Processors

25%

Standby2%

Other45%

Fans12%

DC/DC losses8%

2U system (average config)2U system (average config)– Unrestricted Rack=21.6KW (20)Unrestricted Rack=21.6KW (20)

– 40 total Processors40 total Processors– 721W/sq ft @ 30sq ft/rack721W/sq ft @ 30sq ft/rack

– 6 sys at 90W/sq ft, 6 sys at 90W/sq ft, 12 Processors12 Processors

1082 W AC total1082 W AC total

1U system (average config)1U system (average config)– Unrestricted Rack =35.7KW (40)Unrestricted Rack =35.7KW (40)

– 80 total Processors80 total Processors– 1192W/sq ft @ 30sq ft/rack1192W/sq ft @ 30sq ft/rack

– 7 sys at 90W/sq ft, 7 sys at 90W/sq ft, 14 Processors14 Processors

DC/DC losses10%

Fans9%

Other44%

Standby2%

Processors30%

AC/DC losses25%

Memory11%

Planar4%

Drives6%PCI

3%

894 W AC total894 W AC total

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William Hammond

Issue: Power doesn’t track UtilizationIssue: Power doesn’t track Utilization

Weekday Processor Utilization

0

10

20

30

40

50

60

70

0:00

:00

1:30

:00

3:00

:00

4:30

:00

6:00

:00

7:30

:00

9:00

:00

10:3

0:00

12:0

0:00

13:3

0:00

15:0

0:00

16:3

0:00

18:1

0:00

19:4

0:00

21:1

0:00

22:4

0:00

% U

tili

zati

on

A day in Exchange Workload

DP-500W .NET Web Server

Average Power ~ 170 Watt despite big variation in processor utilization

0102030405060708090

100

1

11 21

31

41

51

61

71

81

91

10

1

111

12

1

13

1

14

1

15

1

16

1

17

1

Time

Pro

ce

ss

or

Utl

iza

tio

n

020406080100120140160180200220

CPU 0 CPU1 Power

Processor utilization indicates how busy a server is.

System power continues to be high during low processor

utilization.

15

William Hammond

Issue: Rack UtilizationIssue: Rack Utilization Power consumption varies widely and not Power consumption varies widely and not

well understood by End Userswell understood by End Users

– Wide variance based on configuration Wide variance based on configuration and utilization and utilization

– Full Nameplate typically leaves rack Full Nameplate typically leaves rack space, power, and cooling headroom space, power, and cooling headroom under many configurations…under many configurations…lost ROIlost ROI

– Simple nameplate de-rating under-Simple nameplate de-rating under-predicts full configuration consumption, predicts full configuration consumption, tripped breakers and downtime resulttripped breakers and downtime result!!

Nameplatepower

“Typical”Power Draw

Need reliable industry methodology to close the rack utilization gap

Rackutilization

gap

SystemPower Range

William Hammond

IntelIntel®® Power Power UtilitiesUtilities

Demand Based SwitchingDemand Based Switching Power CalculatorPower Calculator Power MonitorPower Monitor

17

William Hammond

Intel®® Power Utilities

IntelIntel®® Power Utilities - Summary Power Utilities - Summary

Demand Based SwitchingDemand Based Switching reduces active powerreduces active power2.80 GHz

1.2V

EXAMPLE ONLY

High

Low

Utilization

3.20 GHz1.3V

3.60 GHz1.4V

2.80 GHz1.2V

EXAMPLE ONLY

High

Low

Utilization

3.20 GHz1.3V

3.60 GHz1.4V

Software

310W310WTotalTotal

30W30W11PlanarPlanar

40W40W66MemMem

240W240W22CPUCPU

PwrPwrQtyQtyCompComp

310W310WTotalTotal

30W30W11PlanarPlanar

40W40W66MemMem

240W240W22CPUCPU

PwrPwrQtyQtyCompComp

1

2

BIOS Power CalculatorPower Calculator increases rack utilizationincreases rack utilization

Power MonitorPower Monitor provides provides real power reportingreal power reporting

100200

300

BaseboardMgmt Controller

PSMI Power Supply

Input Power

Output Power

Critical Events

SM Bus

N+1N+1

18

William Hammond

0

10

20

30

40

50

60

70

80

90

1001 12 23 34 45 56 67 78 89 100

111

122

133

144

155

166

177

188

0%

20%

40%

60%

80%

100%

120%

CPU 0 CPU 1 P with DBS P w/o DBS

Estimated power profile for the “hypothetical example”

% p

roce

sso

r u

tiliz

atio

n

Server system power without DBS

Server system power with DBS

Assumptions: All components except processor consume fixed amount of power

DBS gives application the power when it is neededDBS gives application the power when it is needed

AC power as % of max AC power

Solution: Solution: DDemand emand BBased ased SSwitchingwitching

Here….

To here….

William Hammond

19

William Hammond

Utilizes Enhanced Intel® Utilizes Enhanced Intel® SpeedStep® Technology SpeedStep® Technology

Dynamically reduces processor Dynamically reduces processor speed/power based on demandspeed/power based on demand

Reduces system power up to Reduces system power up to 24% for typical CPU utilizations24% for typical CPU utilizations**

** ** System based on Intel® Server Board SE7520JR2 board, 4 GB DDR2-400 memory. 24% System based on Intel® Server Board SE7520JR2 board, 4 GB DDR2-400 memory. 24% power savings at approximately 46% CPU utilization with DBS OFF running WeBench. See power savings at approximately 46% CPU utilization with DBS OFF running WeBench. See backup for full system configuration. Customer results may vary depending on hardware and backup for full system configuration. Customer results may vary depending on hardware and software configuration.software configuration.

2.80 GHz1.2V

EXAMPLE ONLY

High

Low

Utilization3.20 GHz1.3V

3.60 GHz1.4V

Lower operating costs with DBSLower operating costs with DBS

Intel®® Power Utilities

Demand Based Switching (DBS)Demand Based Switching (DBS)

20

William Hammond

Intel®® Power Utilities

DBS - System Power BenefitsDBS - System Power Benefits

*Customer results may vary depending on hardware and software configuration.*Customer results may vary depending on hardware and software configuration.

1U Intel® Xeon™ processor platform

45% CPU utilization running WebBench

Power Meter

100 200 300

DBS OFF

100 200 300

DBS ON

316W316W

240W240W

Power Meter

100 200 300

DBS OFF

Power Meter

100 200 300

DBS OFF

100 200 300

DBS OFF

100 200 300

DBS ON

100 200 300

DBS ON

316W316W

240W240W

$100K Savings $100K Savings annually for every annually for every

500 servers500 serversPDU

PDUPDU

PDUPDU

PDUPDU

PDUPDU

PDUPDU

PDU

Measurements based on Intel testing.Cost assumptions made for systems tested:a. “Power in” costs assumed at $0.10 / KWhb. “Cooling costs” assumed to be roughly 2X the power-in costs

$100K Savings $100K Savings annually for every annually for every

500 servers500 serversPDU

PDUPDU

PDUPDUPDUPDUPDUPDU

PDUPDUPDUPDU

PDUPDU

PDUPDUPDUPDUPDUPDU

PDUPDUPDUPDU

PDUPDU

PDUPDUPDUPDUPDUPDU

PDUPDUPDUPDU

PDUPDU

PDUPDUPDUPDUPDUPDU

PDUPDUPDU

Measurements based on Intel testing.Cost assumptions made for systems tested:a. “Power in” costs assumed at $0.10 / KWhb. “Cooling costs” assumed to be roughly 2X the power-in costs

You can You can reduce powerreduce power and and save operating costssave operating costs with DBS with DBS

21

William Hammond

Software

310W310WTotalTotal

30W30W11PlanarPlanar

40W40W66MemMem

240W240W22CPUCPU

PwrPwrQtyQtyCompComp

310W310WTotalTotal

30W30W11PlanarPlanar

40W40W66MemMem

240W240W22CPUCPU

PwrPwrQtyQtyCompComp

1

2

BIOS

Power Monitor:Power Monitor:– Utility measures Utility measures actual power actual power

consumptionconsumption– Real time data collection instead Real time data collection instead

of worst case assumptionsof worst case assumptions

Power Calculator:Power Calculator:– Utility estimates Utility estimates worst case worst case

system powersystem power – Uses actual system components Uses actual system components

versus nameplate (full versus nameplate (full configuration)configuration)

Reliable, standardized Reliable, standardized approach to help optimize approach to help optimize

rack utilizationrack utilization

Intel®® Power Utilities

IntelIntel®® Power Utilities Power Utilities

BaseboardMgmt Controller

PSMI Power Supply

Input Power

Output Power

Critical Events

SM Bus

N+1N+1100

200300

22

William Hammond

IntelIntel®® Power Utilities – Sample Power Utilities – Sample GUIGUI

Intel®® Power Utilities

Efficiency

Load

Line

23

William Hammond

IntelIntel®® Power Utilities - Power Utilities - StandardsStandards

Intel®® Power Utilities

IPMI/CIM+

BMCFirmware

IPMIengine

PXE/EFI

CIM+engine

IPMIprovider

SNMPprovider

CIMschema

CIMOM

Unified Mgt Module (UMM)PolicyMgr

ScriptingEngine

Chassismgt

PSMI Enabled Power Supply

Line PowerLoad Power (n)

Critical Events

SMB-I

CIM-XML

BMC®® Patrol*

CA®® Unicenter*

Enigmatec®® DR-Orchestator*

HP®® Open View*

IBM®® Tivoli*

Intel®® Server Console*

MS®® Operations Manager*

Potential Future Consoles

LED Control

Predictive Fail

*Other names and brands may be claimed as the property of others. These [vendors, devices] are listed by Intel as a convenience to Intel's general customer base, but Intel does not make any representations or warranties whatsoever

regarding quality, reliability, functionality, or compatibility of these devices. This list and/or these devices may be subject to change without notice.

24

William Hammond

IntelIntel®® Power Utilities - DC Rack Power Utilities - DC Rack BenefitsBenefits**

Typical

Nameplate ApproachNameplate ApproachWasted space except in max configurations

7

PConfig utilityPConfig utilityDatacenter safely gains back critical space based on configuration

Simple DeSimple De--ratingratingMaximum rack utilization,but risk down-time

11

12

13

MaximumMinimum

7

18

20

22

7

8

9

Number of serversin a 6.7KW rack

Key

Platform Configuration

William Hammond

Typical

Nameplate ApproachNameplate ApproachWasted space except in max configurations

7

PConfig utilityPConfig utilityDatacenter safely gains back critical space based on configuration

Simple DeSimple De--ratingratingMaximum rack utilization,but risk down-time

11

12

13

MaximumMinimum

7

18

20

22

7

8

9

Number of serversin a 6.7KW rack

Key

Platform Configuration

William Hammond

* * System average based on Intel® Dual Processor 1U reference Server Board 2005 Power System average based on Intel® Dual Processor 1U reference Server Board 2005 Power Budgets. Actual end user power profile may vary depending on manufacturer and Budgets. Actual end user power profile may vary depending on manufacturer and

configuration.configuration.

25

William Hammond

IntelIntel®® Power Utilities - Summary Power Utilities - Summary

IntelIntel®® Power Utilities provide reliable, Power Utilities provide reliable, standardized approach to help optimize standardized approach to help optimize rack utilization and minimize OpExrack utilization and minimize OpEx

Intel®® Power Utilities

*Other names and brands may be claimed as the property of others. These [vendors, devices] are listed by Intel as a convenience to Intel's general customer base, but Intel does not make any representations or warranties whatsoever

regarding quality, reliability, functionality, or compatibility of these devices. This list and/or these devices may be subject to change without notice.

William Hammond

DC Power DC Power Futures – Futures – Attacking the Attacking the OpEx problemOpEx problem

27

William Hammond

Operational Expense - ProblemOperational Expense - Problem

Business needs not aligned with power Business needs not aligned with power consumption – neither platform nor DCconsumption – neither platform nor DC– Little capability to minimize OpExLittle capability to minimize OpEx

– Little capability to fully maximize CapEx Little capability to fully maximize CapEx

– Pre-defined Service Level Agreements (SLA) are Pre-defined Service Level Agreements (SLA) are measured historicallymeasured historically

DC OpEx futures

Power Utilities is part of the Power Utilities is part of the solutionsolution

28

William Hammond

Operational Expense - SolutionsOperational Expense - Solutions

Web services type interaction is the future for Web services type interaction is the future for both platform and traditional facilitiesboth platform and traditional facilities– Service Oriented Enterprise controlService Oriented Enterprise control

– Service Oriented Infrastructure communicationService Oriented Infrastructure communication

– Service Oriented Architecture compute/facilityService Oriented Architecture compute/facility

All assets will report capabilities via CIM+XMLAll assets will report capabilities via CIM+XML**

– CoD/grid deployments used to match to SLACoD/grid deployments used to match to SLA

– Highest business needs will get priority systemsHighest business needs will get priority systems

– Lower business needs will be OpEx optimizedLower business needs will be OpEx optimized

DC OpEx futures

Power Utilities will grow with Power Utilities will grow with your DCyour DC

29

William Hammond

Future DirectionsFuture Directions Datacenter as a “full feedback” systemDatacenter as a “full feedback” system

– Cooling supplied as needed, to the systems reqCooling supplied as needed, to the systems req– Goes after the 50% utility cooling costsGoes after the 50% utility cooling costs

Model ROI/TCO for multiple traditional DC Model ROI/TCO for multiple traditional DC capabilitycapability– Open ballroom with minimum racks Open ballroom with minimum racks

– 1 AHU = 3 Racks, 3x3 active grid, 210 Servers1 AHU = 3 Racks, 3x3 active grid, 210 Servers

– Rack utilization matched to current thermal planning Rack utilization matched to current thermal planning – 1 AHU = 22 racks, 1 active / 2 inactive tiles, 210 Servers1 AHU = 22 racks, 1 active / 2 inactive tiles, 210 Servers

Monitor/Enable new cooling modelsMonitor/Enable new cooling models– Cold plate technologies enable dense server configsCold plate technologies enable dense server configs– Emergent DC’s enabling spot solutions (non-air)Emergent DC’s enabling spot solutions (non-air)– ROI models for super dense DC’sROI models for super dense DC’s

DC OpEx futures

William Hammond

SummarySummary

31

William Hammond

SummarySummary

IntelIntel®® delivering a delivering a holistic platform responseholistic platform response to to impact impact allall areas of power consumption areas of power consumption

IntelIntel®® Power Utilities Power Utilities provide reliable, provide reliable, standardized approach to help optimize rack standardized approach to help optimize rack utilization and minimize OpExutilization and minimize OpEx

IntelIntel®® Power Utilities will grow with your DC Power Utilities will grow with your DC IntelIntel®® Processors – Processors – The processor for your DCThe processor for your DC

Summary

32

William Hammond

Thank You!Thank You!

William Hammond

BackupBackup

34

William Hammond

PDU

PDU

PDU UPS’s Transfer

Switch

Modern Datacenter (DC) TermsModern Datacenter (DC) Terms

AHU

AHU

AHU

Panel

GridGrid3-Phase3-Phase

Diesel Backup

Generator

Power Consumption Review

AHU

ChillerChiller

Condenser Condenser looploop

CoolingCoolingTowerTower

• AHUAHU:: Air Handling Unit, part of cooling systemAir Handling Unit, part of cooling system• HVACHVAC: Heating/Ventilating/Air Conditioning : Heating/Ventilating/Air Conditioning • PDUPDU: Power Distribution Unit: Power Distribution Unit• PSPS: Power Supply: Power Supply• SNMPSNMP: Simple Network Management Protocol: Simple Network Management Protocol• UPS: UPS: Uninterruptible Power SupplyUninterruptible Power Supply

*Other names and brands may be claimed as the property of others

35

William Hammond

Computer/Financial Industry Computer/Financial Industry TermsTerms

Power Consumption Review

• ACPIACPI: Advanced Configuration and Power Interface, www.acpi.info*: Advanced Configuration and Power Interface, www.acpi.info*• BMCBMC: Baseboard management Controller: Baseboard management Controller • CapExCapEx: Capital Expenses (like DC itself): Capital Expenses (like DC itself) • CIMCIM: Common Information Module – see DMTF*: Common Information Module – see DMTF*• DMTF*DMTF*: Distributed Management Task Force: Distributed Management Task Force, , www.dmtf.org*www.dmtf.org*• GUIGUI: Graphical User Interface: Graphical User Interface • II22CC™™: : Baseboard Interface Controller from Philips SemiconductorBaseboard Interface Controller from Philips Semiconductor®*®*

• IMPIIMPI: Intelligent Platform Management Interface,: Intelligent Platform Management Interface,www.intel.com/design/servers/impiwww.intel.com/design/servers/impi

• OpExOpEx: Operational Expenses (like power): Operational Expenses (like power)• PSMI: Power Supply Management Interface, www.ssiforum.org*PSMI: Power Supply Management Interface, www.ssiforum.org*• ROIROI: Return on Investment: Return on Investment• SMB-ISMB-I: System Management Bus Interface, www.smbus.org*: System Management Bus Interface, www.smbus.org*• UPS: UPS: Uninterruptible Power SupplyUninterruptible Power Supply• WSWS: Web Services: Web Services• XMLXML: E: Exxtensible tensible MMarkup arkup LanguageLanguage

*Other names and brands may be claimed as the property of others