Memory Limits for Windows Releases

Question

For Enterprises Physical Memory Limits: Windows Server 2008 R2 The following table specifies the limits on physical memory for Windows Server 2008 R2. Windows Server 2008 R2 is available only in 64-bit editions. Version Limit on X64 Limit on IA64 Windows Server 2008 R2 Datacenter 2 TB Windows Server 2008 R2 Enterprise 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 Physical Memory Limits: Windows Server 2008 The following table specifies the limits on physical memory for Windows Server 2008. Limits greater than 4 GB for 32-bit Windows assume that PAE is enabled. Version Limit on X86 Limit on X64 Limit on IA64 Windows Server 2008 Datacenter 64 GB 1 TB Windows Server 2008 Enterprise 64 GB 1 TB Windows Server 2008 HPC Edition 128 GB Windows Server 2008 Standard 4 GB 32 GB Windows Server 2008 for Itanium-Based Systems 2 TB Windows Small Business Server 2008 4 GB 32 GB Windows Web Server 2008 4 GB 32 GB Physical Memory Limits: Windows Home Server Windows Home Server is available only in a 32-bit edition. The physical memory limit is 4 GB. Physical Memory Limits: Windows Server 2003 R2 The following table specifies the limits on physical memory for Windows Server 2003 R2. Limits over 4 GB for 32-bit Windows assume that PAE is enabled. Version Limit on X86 Limit on X64 Windows Server 2003 R2 Datacenter Edition 64 GB (16 GB with 4GT) 1 TB Windows Server 2003 R2 Enterprise Edition 64 GB (16 GB with 4GT) 1 TB Windows Server 2003 R2 Standard Edition 4 GB 32 GB Physical Memory Limits: Windows Server 2003 with Service Pack 2 (SP2) The following table specifies the limits on physical memory for Windows Server 2003 with Service Pack 2 (SP2). Limits over 4 GB for 32-bit Windows assume that PAE is enabled. Version Limit on X86 Limit on X64 Limit on IA64 Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition 64 GB(16 GB with 4GT) 1 TB 2 TB Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition 64 GB(16 GB with 4GT) 1 TB 2 TB Windows Server 2003 with Service Pack 2 (SP2), Standard Edition 4 GB 32 GB Physical Memory Limits: Windows Server 2003 with Service Pack 1 (SP1) The following table specifies the limits on physical memory for Windows Server 2003 with Service Pack 1 (SP1). Limits over 4 GB for 32-bit Windows assume that PAE is enabled. Version Limit on X86 Limit on X64 Limit on IA64 Windows Server 2003 with Service Pack 1 (SP1), Datacenter Edition 64 GB(16 GB with 4GT) X64 1 TB 1 TB Windows Server 2003 with Service Pack 1 (SP1), Enterprise Edition 64 GB(16 GB with 4GT) X64 1 TB 1 TB Windows Server 2003 with Service Pack 1 (SP1), Standard Edition 4 GB 32 GB Physical Memory Limits: Windows Server 2003 The following table specifies the limits on physical memory for Windows Server 2003. Limits over 4 GB for 32-bit Windows assume that PAE is enabled. Version Limit on X86 Limit on IA64 Windows Server 2003, Datacenter Edition 64 GB(16 GB with 4GT) 512 GB Windows Server 2003, Enterprise Edition 64 GB(16 GB with 4GT) 512 GB Windows Server 2003, Standard Edition 4 GB Windows Server 2003, Web Edition 2 GB Windows Small Business Server 2003 4 GB Windows Compute Cluster Server 2003 32 GB Windows Storage Server 2003, Enterprise Edition 8 GB Windows Storage Server 2003 4 GB

Phukon · Answer

For Clients:

Physical Memory Limits: Windows 7

The following table specifies the limits on physical memory for Windows 7.

Version	Limit on X86	Limit on X64
Windows 7 Ultimate	4 GB	192 GB
Windows 7 Enterprise	4 GB	192 GB
Windows 7 Professional	4 GB	192 GB
Windows 7 Home Premium	4 GB	16 GB
Windows 7 Home Basic	4 GB	8 GB
Windows 7 Starter	2 GB	N/A

Physical Memory Limits: Windows Vista

The following table specifies the limits on physical memory for Windows Vista.

Version	Limit on X86	Limit on X64
Windows Vista Ultimate	4 GB	128 GB
Windows Vista Enterprise	4 GB	128 GB
Windows Vista Business	4 GB	128 GB
Windows Vista Home Premium	4 GB	16 GB
Windows Vista Home Basic	4 GB	8 GB
Windows Vista Starter	1 GB

Physical Memory Limits: Windows XP

The following table specifies the limits on physical memory for Windows XP.

Version	Limit on X86	Limit on X64	Limit on IA64
Windows XP	4 GB	128 GB	128 GB (not supported)
Windows XP Starter Edition	512 MB	N/A	N/A

Physical Memory Limits: Windows Embedded

The following table specifies the limits on physical memory for Windows Embedded.

Version	Limit on X86	Limit on X64
Windows XP Embedded	4 GB
Windows Embedded Standard 2009	4 GB
Windows Embedded Standard 7	4 GB	192 GB

maze-FJVHo · Answer

What is the purpose of this post, to share the current memory limits with the various Windows versions?  I'm confused as this is posted as a question but seems to be just informational and not in response to any inquiries.  Also, if this information is copied from another site please provide short description and a link to that site in the future.  Thanks!

Phukon · Answer

This is table is for Comparing the OS versions only, thanks for the Correction. REF: http://blogs.technet.com/b/exchange/archive/2005/07/05/407330.aspx

Microsoft

Physical Memory Limits: Windows Vista

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