Windows O/S Memory Limits

Please be aware of the maximum memory allowances for your operating system. If you buy more RAM than your O/S can manage, then it will not be used. Below is a quick reference, further information can be found at Microsoft’s Memory Limits for Windows and Windows Server Releases.


Windows Server 2016

Version Limit on X64
Windows Server 2016 Datacenter 24 TB
Windows Server 2016 Standard 24 TB

Windows Server 2012 R2

Version Limit on X64
Windows Server 2012 R2 Datacenter 4 TB
Windows Server 2012 R2 Foundation 32 GB
Windows Server 2012 R2 Standard 4 TB
Windows Server 2012 R2 Essentials 64 GB

Windows Server 2008 R2

Version Limit on X64
Windows Server 2008 R2 Datacenter 2 TB
Windows Server 2008 R2 Enterprise 2 TB
Windows Server 2008 R2 Foundation 8 GB
Windows Server 2008 R2 Standard 32 GB
Windows Server 2008 R2 HPC 128 GB
Windows Server 2008 R2 Web Edition 32 GB

Windows Server 2008

Version Limit on X86 Limit on X64
Windows Server 2008 Datacenter 64 GB 1 TB
Windows Server 2008 Enterprise 64 GB 1 TB
Windows Server 2008 HPC Edition  — 128 GB
Windows Server 2008 Standard 4 GB 32 GB
Windows Small Business Server 2008 4 GB 32 GB
Windows Web Server 2008 4 GB 32 GB

Windows Server 2003 R2

Version Limit on X86 Limit on X64
Windows Server 2003 R2 Datacenter Edition 64 GB 1 TB
Windows Server 2003 R2 Enterprise Edition 64 GB 1 TB
Windows Server 2003 R2 Standard Edition 4 GB 32 GB