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Maximum RAM support for today Windows operating systems

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:

Prasad Sampath Wickramasinghe said...

Seems like a good article:
http://blogs.technet.com/markrussinovich/archive/2008/07/21/3092070.aspx

Have a look...

Anonymous said...

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.