| Version | Limit in 32-bit Windows | Limit in 64-bit Windows | ||
| Windows Server 2008 R2 Datacenter | N/A | 2 TB | ||
| Windows Server 2008 R2 Enterprise | N/A | 2 TB | ||
| Windows Server 2008 R2 for Itanium-Based Systems | N/A | 2 TB | ||
| Windows HPC Server 2008 R2 | N/A | 128 GB | ||
| Windows Web Server 2008 R2 | N/A | 32 GB | ||
| Windows Server 2008 R2 Standard | N/A | 32 GB | ||
| Windows Server 2008 R2 Foundation | N/A | 8 GB | ||
| Windows Server 2008 Datacenter | 64 GB | 2 TB | ||
| Windows Server 2008 Enterprise | 64 GB | 2 TB | ||
| Windows Server 2008 for Itanium-Based Systems | N/A | 2 TB | ||
| Windows HPC Server 2008 | N/A | 128 GB | ||
| Windows Web Server 2008 | 4 GB | 32 GB | ||
| Windows Server 2008 Standard | 4 GB | 32 GB | ||
| Windows Small Business Server 2008 | 4 GB | 32 GB |
Source:
http://msdn.microsoft.com/en-us/library/aa366778
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