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Enterprise Memory Architecture

Updated: January 21, 2005

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Enterprise Memory Architecture

Enterprise Memory Architecture (EMA) increases the amount of physical memory available to applications. EMA supports two types of memory enhancement: application memory tuning--also known as 4-gigabyte tuning (4GT)--and Physical Address Extension (PAE) X86. Neither is enabled by default. Both application memory tuning and PAE must be manually enabled by editing the Boot.ini file.


  • This feature is not required on Microsoft® Windows® XP 64-bit Edition (Itanium) or the 64-bit versions of the Microsoft® Windows Server 2003 family.

  • This topic does not apply to Windows Server 2003, Web Edition.

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