There are multiple Microsoft Operating System releases with their own set of features and limitations. I am writing this post highlighting only Memory Limitations in each Windows Operating System Releases. I would be only covering Windows Server Operating Systems and not Desktop Operating Systems.
Please find below Table for more information:
Windows Server 2003
Version
|
Limit on x86
|
Limit on IA64
|
Windows 2003, Datacenter Edition
|
64GB [16GB with 4GT]
|
512GB
|
Windows 2003, Enterprise Edition
|
64GB [16GB with 4GT]
|
512GB
|
Windows 2003, Standard Edition
|
4GB
|
|
Windows 2003, Web Edition
|
2GB
|
|
Windows Small Business Server 2003
|
4GB
|
|
Windows Compute Cluster Server 2003
|
32GB
|
|
Windows Storage Server 2003, Enterprise Edition
|
8GB
|
|
Windows Storage Server 2003
|
4GB
|
Windows Server 2003 SP1
Version
|
Limit on x86
|
Limit on x64
|
Limit on IA64
|
Windows 2003 SP1, Datacenter Edition
|
64GB [16GB with 4GT]
|
1TB
|
1TB
|
Windows 2003 SP1, Enterprise Edition
|
64GB [16GB with 4GT]
|
1TB
|
1TB
|
Windows 2003 SP1, Standard Edition
|
4GB
|
32GB
|
Windows Server 2003 SP2
Windows Server 2003 R2
Version
|
Limit on x86
|
Limit on x64
|
Limit on IA64
|
Windows 2003 SP2, Datacenter Edition
|
64GB [16GB with 4GT]
|
1TB
|
2TB
|
Windows 2003 SP2, Enterprise Edition
|
64GB [16GB with 4GT]
|
1TB
|
2TB
|
Windows 2003 SP2, Standard Edition
|
4GB
|
32GB
|
Windows Server 2003 R2
Version
|
Limit on x86
|
Limit on x64
|
Windows 2003 R2, Datacenter Edition
|
64GB [16GB with 4GT]
|
1TB
|
Windows 2003 R2, Enterprise Edition
|
64GB [16GB with 4GT]
|
1TB
|
Windows 2003 R2, Standard Edition
|
4GB
|
32GB
|
Windows Server 2008
Version
|
Limit on x86
|
Limit on x64
|
Limit on IA64
|
Windows 2008, Datacenter Edition
|
64GB
|
1TB
|
|
Windows 2008, Enterprise Edition
|
64GB
|
1TB
|
|
Windows 2008, HPC Edition
|
128GB
|
||
Windows 2008, Standard Edition
|
4GB
|
32GB
|
|
Windows 2008, Itanium Based Systems
|
2TB
|
||
Windows Small Business Server 2008
|
4GB
|
32GB
|
|
Windows Web Server 2008
|
4GB
|
32GB
|
Windows Server 2008 R2
Version
|
Limit on x64
|
Limit on IA64
|
Windows 2008 R2, Datacenter Edition
|
2TB
|
|
Windows 2008 R2, Enterprise Edition
|
2TB
|
|
Windows 2008 R2, Itanium Based Systems
|
2TB
|
|
Windows 2008 R2, Foundation Edition
|
8GB
|
|
Windows 2008 R2, Standard Edition
|
32GB
|
|
Windows 2008 R2, HPC Edition
|
128GB
|
|
Windows 2008 R2, Web Edition
|
32GB
|
Windows Server 2012
Version
|
Limit on x64
|
Windows 2012, Datacenter Edition
|
4TB
|
Windows 2012, Standard Edition
|
4TB
|
Windows 2012, Essentials Edition
|
64GB
|
Windows 2012, Foundation Edition
|
32GB
|
Windows Storage Server 2012 Workgroup
|
32GB
|
Windows Storage Server 2012 Standard
|
4TB
|
Hyper-V Server 2012
|
4TB
|
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