How to add processors to a computer that is running Windows Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Vista, Windows 7 or Windows XP Professional x64 Edition

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Article ID: 888729 - View products that this article applies to.
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INTRODUCTION

This article discusses how to add more processors to a computer that is running Microsoft Windows Operating System listed in Applies To section. 

MORE INFORMATION

The following list contains information about the number of processors that are supported in the various versions of Windows Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Vista, Windows 7 and in Windows XP Professional x64 Edition:   

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Client SKUsMaximum Physical Processors Supported
Windows XP Professional x64 Edition2
  
Windows Vista Starter1
Windows Vista Home Basic1
Windows Vista Home Premium1
Windows Vista Enterprise Edition2
Windows Vista Business Edition2
Windows Vista Ultimate Edition2
  
Windows 7 Starter Edition1
Windows 7 Home Basic Edition1
Windows 7 Home Premium Edition1
Windows 7 Professional Edition2
Windows 7 Enterprise Edition2
Windows 7 Ultimate Edition2
Collapse this tableExpand this table
Server SKUsMaximum Physical Processors Supported
Windows Server 2003 Web Edition2
Windows Server 2003 Standard Edition4
Windows Server 2003 Enterprise Edition8
Windows Server 2003 Datacenter Edition32
Windows Server 2003 Standard x64 Edition4
Windows Server 2003 Enterprise x64 Edition8
Windows Server 2003 Datacenter x64 Edition64
  
Windows Server 2008 Foundation Edition1
Windows Server 2008 Web Edition4
Windows Server 2008 Standard Edition4
Windows Server 2008 Enterprise Edition8
Windows Server 2008 Datacenter Edition64
Windows Server 2008 Itanium  Edition64
  
Windows Server 2008 R2 Foundation x64 Edition1
Windows Server 2008 R2 Standard x64 Edition4
Windows Server 2008 R2 Web x64 Edition4
Windows Server 2008 R2 HPC x64 Edition4
Windows Server 2008 R2 Enterprise x64 Edition8
Windows Server 2008 R2 Datacenter x64 Edition64
Windows Server 2008 R2 Itanium Edition64

To add more processors to a computer that has only one processor, the following conditions must be true:
  • The computer has a motherboard that can support multiple processors.
  • The processors that you want to add to the computer use the same speed and the same stepping.
  • Any BIOS updates or driver updates to the motherboard that you want to apply are installed on the computer before you add the additional processors.
Note Before you add a processor to the computer, make sure that the computer is turned off.

If these conditions are true, you can add the processor or processors. When you restart the computer, Plug and Play detects and installs the processor or processors.

All versions of Windows Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Vista, Windows 7 and of Windows XP Professional x64 Edition use the Advanced Configuration and Power Interface (ACPI) Advanced Programmable Interrupt Controller (APIC) hardware abstraction layer (HAL).

Note The HAL option in Device Manager may change from ACPI APIC Uniprocessor HAL to ACPI APIC Multiprocessor HAL. This change does not indicate a change in HAL type. Instead, this indicates a change in the kernel.

After you add an additional processor to the computer, the computer detects the processor the next time that you start the computer. If the processor is not detected when you restart the computer, you must investigate possible hardware issues. For example, the processor may not be detected if one or more of the following conditions are true:
  • The processor is incorrectly seated.
  • The processor is damaged.
  • The motherboard does not support the processor.
  • The operating system is already supporting its maximum number of processors.
For more information about the 32-bit versions of Windows Server 2003, visit the following Microsoft Web site:
http://www.microsoft.com/windowsserver2003/docs/MS_BMC.pdf
For more information about the processor and memory capabilities of x64-based versions of Windows Server 2003 and of Windows XP Professional x64 Edition, click the following article number to view the article in the Microsoft Knowledge Base:
888732 Processor and memory capabilities of Windows XP Professional x64 Edition and of the x64-based versions of Windows Server 2003

Technical support for Windows x64 editions

Your hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:
http://www.microsoft.com/windowsxp/64bit/default.mspx
For product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:
http://www.microsoft.com/windowsserver2003/64bit/x64/editions.mspx

Properties

Article ID: 888729 - Last Review: October 26, 2011 - Revision: 6.0
APPLIES TO
  • Microsoft Windows XP Professional x64 Edition
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows Server 2003, Web Edition
  • Windows Vista Starter
  • Windows Vista Home Basic
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Business
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Ultimate
  • Windows Vista Ultimate 64-bit Edition
  • Windows 7 Starter
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Windows Server 2008 Foundation
  • Windows Server 2008 Standard
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Datacenter
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
Keywords: 
kbwinservsetup kbinfo kbhowto KB888729

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