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http://msdn.microsoft.com/en-us/library/aa366778.aspx
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Physical Memory Limits: Windows 7 |
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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 | ||
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Physical Memory Limits: Windows Server 2008 R2 |
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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 | ||
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Physical Memory Limits: Windows Server 2008 | |||
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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 | |
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Physical Memory Limits: Windows Vista |
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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 | ||
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Physical Memory Limits: Windows Home Server |
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Windows Home Server is available only in a 32-bit edition. The physical memory limit is 4 GB. | |||
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Physical Memory Limits: Windows Server 2003 R2 |
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Version |
Limit on X86 | Limit on X64 | |
| Windows Server 2003 R2 Datacenter Edition | 64 GB | 1 TB | |
| (16 GB with 4GT) | |||
| Windows Server 2003 R2 Enterprise Edition | 64 GB | 1 TB | |
| (16 GB with 4GT) | |||
| Windows Server 2003 R2 Standard Edition | 4 GB | 32 GB | |
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Physical Memory Limits: Windows Server 2003 with Service Pack 2 (SP2) | |||
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Version |
Limit on X86 | Limit on X64 | Limit on IA64 |
| Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition | 64 GB | 1 TB | 2 TB |
| (16 GB with 4GT) | |||
| Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition | 64 GB | 1 TB | 2 TB |
| Windows Server 2003 with Service Pack 2 (SP2), Standard Edition | 4 GB | 32 GB | |
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Physical Memory Limits: Windows Server 2003 with Service Pack 1 (SP1) | |||
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Version |
Limit on X86 | Limit on X64 | Limit on IA64 |
| Windows Server 2003 with Service Pack 1 (SP1), Datacenter Edition | 64 GB | X64 1 TB | 1 TB |
| (16 GB with 4GT) | |||
| Windows Server 2003 with Service Pack 1 (SP1), Enterprise Edition | 64 GB | X64 1 TB | 1 TB |
| (16 GB with 4GT) | |||
| Windows Server 2003 with Service Pack 1 (SP1), Standard Edition | 4 GB | 32 GB | |
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Physical Memory Limits: Windows Server 2003 |
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Version |
Limit on X86 | Limit on IA64 | |
| Windows Server 2003, Datacenter Edition | 64 GB | 512 GB | |
| (16 GB with 4GT) | |||
| Windows Server 2003, Enterprise Edition | 64 GB | 512 GB | |
| (16 GB with 4GT) | |||
| 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 | ||
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Physical Memory Limits: Windows XP | |||
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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 | ||
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Physical Memory Limits: Windows 2000 | |||
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Version |
Limit on X86 | ||
| 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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Physical Memory Limits: Windows Embedded | |||
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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 | |
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