Memory Limits for Windows Releases


 

Physical Memory Limits: Windows 7

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

Version Limit in 32-bit Windows Limit in 64-bit Windows
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

2 GB

 

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 in 64-bit Windows
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 in 32-bit Windows Limit in 64-bit Windows
Windows Server 2008 Datacenter

64 GB

2 TB

Windows Server 2008 Enterprise

64 GB

2 TB

Windows Server 2008 HPC Edition

Not applicable

128 GB

Windows Server 2008 Standard

4 GB

32 GB

Windows Server 2008 for Itanium-Based Systems

Not applicable

2 TB

Windows Small Business Server 2008

4 GB

32 GB

Windows Web Server 2008

4 GB

32 GB

 

Physical Memory Limits: Windows Vista

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

Version Limit in 32-bit Windows Limit in 64-bit Windows
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

Not applicable

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

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 in 32-bit Windows Limit in 64-bit Windows

Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition

128 GB

64 GB with 4GT

IA64 2 TB

X64 1 TB

Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition

64 GB

IA64 2 TB

X64 1 TB

Windows Storage Server 2003, Enterprise Edition

8 GB

Not applicable

Windows Storage Server 2003

4 GB

Not applicable

Windows Server 2003 R2 Datacenter Edition

Windows Server 2003 with Service Pack 1 (SP1), Datacenter Edition

128 GB

16 GB with 4GT

1 TB

Windows Server 2003 R2 Enterprise Edition

Windows Server 2003 with Service Pack 1 (SP1), Enterprise Edition

64 GB

16 GB with 4GT

1 TB

Windows Server 2003 R2 Standard Edition

Windows Server 2003, Standard Edition SP1

Windows Server 2003, Standard Edition SP2

4 GB

32 GB

Windows Server 2003, Datacenter Edition

128 GB

16 GB with 4GT

512 GB

Windows Server 2003, Enterprise Edition

32 GB

16 GB with 4GT

64 GB

Windows Server 2003, Standard Edition

4 GB

16 GB

Windows Server 2003, Web Edition

2 GB

Not applicable

Windows Small Business Server 2003

4 GB

Not applicable

Windows Compute Cluster Server 2003

Not applicable

32 GB

 

Physical Memory Limits: Windows XP

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

Version Limit in 32-bit Windows Limit in 64-bit Windows
Windows XP

4 GB

128 GB

Windows XP Starter Edition

512 MB

Not applicable

 

Physical Memory Limits: Windows 2000

The following table specifies the limits on physical memory for Windows 2000.

Version Limit in 32-bit Windows
Windows 2000 Professional

4 GB

Windows 2000 Server

4 GB

Windows 2000 Advanced Server

8 GB

Windows 2000 Datacenter Server

32 GB

 
 
 
 
 
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