Physical Memory Limits for Microsoft Windows

Physical memory limits for Microsoft Windows is vary by platform, operating system version. This topic describes physical memory limits for Windows 8, Windows 7, Windows Vista, Windows XP, Windows Server 2012, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003 R2 and Windows Server 2003 with Service Pack 2 (SP2)

Memory Limits for Windows 8
The following list specifies the limits on physical memory for Windows 8.
  • Windows 8 Professional and Enterprise 32-bit (x86) = 4 GB
  • Windows 8 Professional and Enterprise 64-bit (x64) = 512 GB
  • Windows 8 32-bit (x86) = 4 GB
  • Windows 8 64-bit (x64) = 128 GB

Memory Limits for Windows 7
The following list specifies the limits on physical memory for Windows 7.
  • Windows 7 Professional, Enterprise and Ultimate Edition 32-bit (x86) = 4 GB
  • Windows 7 Professional, Enterprise and Ultimate Edition 64-bit (x64) = 192 GB
  • Windows 7 Home Premium Edition 32-bit (x86) = 4 GB
  • Windows 7 Home Premium Edition 64-bit (x64) = 16 GB
  • Windows 7 Home Basic Edition 32-bit (x86) = 4 GB
  • Windows 7 Home Basic Edition 64-bit (x64) = 8 GB
  • Windows 7 Starter Edition 32-bit (x86) = 2 GB
  • Windows 7 Starter Edition 64-bit (x64) = 2 GB

Memory Limits for Windows Vista
The following list specifies the limits on physical memory for Windows Vista
  • Windows Vista Business Professional, Enterprise and Ultimate Edition 32-bit (x86) = 4 GB
  • Windows Vista Business Professional, Enterprise and Ultimate Edition 64-bit (x64) = 128 GB
  • Windows Vista Home Premium Edition 32-bit (x86) = 4 GB
  • Windows Vista Home Premium Edition 64-bit (x64) = 16 GB
  • Windows Vista Home Basic Edition 32-bit (x86) = 4 GB
  • Windows Vista Home Basic Edition 64-bit (x64) = 8 GB
  • Windows Vista Starter Edition 32-bit (x86) = 1 GB

Memory Limits for Windows XP
The following list specifies the limits on physical memory for Windows XP
  • Windows XP Edition 32-bit (x86) = 4 GB
  • Windows XP Edition 64-bit (x64) = 128 GB
  • Windows XP Starter Edition 32-bit (x86) = 512 MB

Memory Limits for Windows Server 2012
The following list specifies the limits on physical memory for Windows Server 2012.
  • Windows Server 2012 Datacenter = 4 TB
  • Windows Server 2012 Standard = 4 TB
  • Windows Server 2012 Essentials = 64 GB
  • Windows Server 2012 Foundation = 32 GB
  • Windows Storage Server 2012 Workgroup = 32 GB
  • Windows Storage Server 2012 Standard = 4 TB
  • Hyper-V Server 2012 = 4 TB

Memory Limits for Windows Server 2008 R2
The following list specifies the limits on physical memory for Windows Server 2008 R2. Windows Server 2008 R2 is available only in 64-bit editions.
  • Windows Server 2008 R2 Enterprise and Datacenter = 2 TB
  • Windows Server 2008 R2 for Itanium-Based Systems = 2 TB
  • Windows Server 2008 R2 Foundation = 8 GB
  • Windows Server 2008 R2 Standard = 32 GB
  • Windows HPC Server 2008 R2 = 128 GB
  • Windows Web Server 2008 R2 = 32 GB

Memory Limits for Windows Server 2008
The following list specifies the limits on physical memory for Windows Server 2008
  • Windows Server 2008 Enterprise and Datacenter Edition 32-bit (x86) = 64 GB
  • Windows Server 2008 Enterprise and Datacenter Edition 64-bit (x64) = 1 TB
  • Windows Server 2008 for Itanium-Based Systems = 2 TB
  • Windows Server 2008 HPC Edition 64-bit (x64) = 128 GB
  • Windows Server 2008 Standard Edition 32-bit (x86) = 4 GB
  • Windows Server 2008 Standard Edition 64-bit (x64) = 32 GB
  • Windows Small Business Server 2008 Edition 32-bit (x86) = 4 GB
  • Windows Small Business Server 2008 Edition 64-bit (x64) = 32 GB
  • Windows Web Server 2008 Edition 32-bit (x86) = 4 GB
  • Windows Web Server 2008Edition 64-bit (x64) = 32 GB

Memory Limits for Windows Server 2003 R2
The following list specifies the limits on physical memory for Windows Server 2003 R2
  • Windows Server 2003 R2 Datacenter Edition 32-bit (x86) = 64 GB (16 GB with 4GT)
  • Windows Server 2003 R2 Datacenter Edition 64-bit (x64) = 1 TB
  • Windows Server 2003 R2 Enterprise Edition 32-bit (x86) = 64 GB (16 GB with 4GT)
  • Windows Server 2003 R2 Enterprise Edition 64-bit (x64) = 1 TB
  • Windows Server 2003 R2 Standard Edition 32-bit (x86) = 4 GB
  • Windows Server 2003 R2 Standard Edition 64-bit (x64) = 32 GB

Memory Limits for Windows Server 2003 with Service Pack 2 (SP2)
The following list specifies the limits on physical memory for Windows Server 2003 with Service Pack 2 (SP2)
  • Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition 32-bit (x86) = 64 GB (16 GB with 4GT)
  • Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition 64-bit (x64) = 1 TB
  • Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition IA64 = 2 TB
  • Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition 32-bit (x86) = 64 GB
  • Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition 64-bit (x64) = 1 TB
  • Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition IA64 = 2 TB
  • Windows Server 2003 with Service Pack 2 (SP2), Standard Edition 32-bit (x86) = 4 GB
  • Windows Server 2003 with Service Pack 2 (SP2), Standard Edition 64-bit (x64) = 32 GB

Source:
MSDN
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