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Physical Memory Limits for Windows Releases

Physical Memory Limits: Windows 7

The following table specifies the limits on physical memory for Windows 7.
VersionLimit on X86Limit 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 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.
VersionLimit on X64Limit 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 thatPAE is enabled.
VersionLimit on X86Limit on X64Limit 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 Vista

The following table specifies the limits on physical memory for Windows Vista.
VersionLimit on X86Limit 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 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.
VersionLimit on X86Limit 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.
VersionLimit on X86Limit on X64Limit 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.
VersionLimit on X86Limit on X64Limit 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.
VersionLimit on X86Limit 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


Physical Memory Limits: Windows XP

The following table specifies the limits on physical memory for Windows XP.
VersionLimit on X86Limit on X64Limit 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.

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