With Windows Server 2008 R2 being the first x64 only version of Microsoft’s popular server operating system the maximum memory configurations are much simpler to remember. It will likely be a while yet before the x32 version of Windows Server 2008 is stopped being deployed fully in production environments meaning that you’ll have to keep tabs on how much memory each version and build type can take.
Although it being relatively straight forward to remember here’s a table outlining the maximum memory limits of the various editions and versions of Windows Server 2008.
| Version | Maximum Memory Limit (x64 Only) |
| Windows Server 2008 R2 Datacenter | 2TB |
| Windows Server 2008 R2 Enterprise | 2TB |
| Windows Server 2008 R2 for Itanium | 2TB |
| Windows Server 2008 R2 Foundation | 8GB |
| Windows Server 2008 R2 Standard | 32GB |
| Windows Web Server 2008 R2 | 32GB |
| Version | Max Memory Limit (x32) | Max Memory Limit (x64) |
| Windows Server 2008 Datacenter | 64GB | 2TB |
| Windows Server 2008 Enterprise | 64GB | 2TB |
| Windows Server 2008 Standard | 4GB | 32GB |
| Windows Small Business Server 2008 | 4GB | 32GB |
| Windows Web Server 2008 | 4GB | 32GB |
