This is the maximum RAM limit for some of commonly used operating systems as of now.
| Version | Limit in 32-bit Windows | Limit in 64-bit Windows |
| Physical Memory Limits for Windows Vista | ||
| 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 | 128 GB |
| Windows Vista Home Basic | 4 GB | 128GB |
| Physical Memory Limits: Windows Server | ||
| Windows Server 2008 Enterprise | 64 GB | 2TB |
| Windows Server 2008 Standard | 4GB | 32GB |
| Windows Server 2003 Service Pack 2, Enterprise Edition | 64GB | 2TB |
| Windows Server 2003 R2 Enterprise Edition | 64GB | 1TB |
| Windows Server 2003 R2 Standard Edition | 4GB | 32GB |
| Windows Server 2003, Enterprise Edition | 32GB | 64GB |
| Windows Server 2003, Standard Edition | 4GB | 16GB |
| Physical Memory Limits: Windows XP | ||
| Windows XP | 4GB | 128GB |
Even though operating system limit of RAM is as above, the actual RAM can be installed is depend on your hardware as well, specially on Motherboard.
Complete list of maximum RAM support is available here at Microsoft site.
2 comments:
Seems like a good article:
http://blogs.technet.com/markrussinovich/archive/2008/07/21/3092070.aspx
Have a look...
This is a limitation in Windows 7 as well. Since x86 architectures have a limited address space, just 4 GB in total, and they have to fit all hardware components, leaving at maximum 3.5 GB, but more in the vicinity of 3.3 GB for RAM. This limitation is valid for all editions of Windows 7 32-bit.
But this is not the case for 64-bit versions of Windows 7. The Home Basic and Starter SKUs can manage up to 8 GB of RAM, with Home Premium taking the limit to 16 GB. The Professional, Enterprise and Ultimate versions of Windows 7 will support as much as 192 GB of RAM.
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