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 |