Here are some notes I made on Memory for windows OS and NOS operating systems.
Memory maximums for current Microsoft® Windows OS’s include:
32-bit OS
Windows 8 (32 bit)
Windows 8 (32 bit)
- Windows 8 Enterprise: 4 GB
- Windows 8 Professional: 4 GB
- Windows 8 Home: 4 GB
Windows 7 (32 bit)
- Ultimate: 4 GB
- Enterprise: 4 GB
- Business: 4 GB
- Home Premium: 4 GB
- Home Basic: 4 GB
- Starter: 2 GB
Windows Vista (32 bit)
- Ultimate: 4 GB
- Enterprise: 4 GB
- Business: 4 GB
- Home Premium: 4 GB
- Home Basic: 4 GB
- Starter: 1 GB
Windows XP (32 bit)
- Professional: 4 GB
- Home: 4 GB
- Starter Edition: 512 MB
Windows Server 2003 (32 bit)
- Datacenter SP2: 128 GB
- Enterprise SP2: 64 GB
- Standard SP1: 4 GB*
- Datacenter R2: 128 GB
- Enterprise R2: 64 GB
- Standard R2: 4 GB*
- Web Edition: 4 GB*
- Small Business Edition: 4 GB*
Windows Server 2008 (32 bit)
- Datacenter: 64 GB
- Enterprise: 64 GB
- Standard: 4 GB
- Web Server: 4 GB
* Certain Microsoft server operating systems can support over 4GB of memory via Physical Address Extension (PAE). Please refer to the Microsoft knowledgebase article located here for more information.
64-bit OS
Windows 8 (64 bit)
Windows 8 (64 bit)
- Enterprise: 512 GB
- Professional: 512 GB
- Home: 128 GB
Windows 7 (64 bit)
- Windows 7 Ultimate: 192 GB
- Windows 7 Enterprise: 192 GB
- Windows 7 Professional: 192 GB
- Windows 7 Home Premium: 16 GB
- Windows 7 Home Basic: 8 GB
- Windows 7 Starter: N/A
Windows Vista (64 bit)
- Ultimate: 128 GB
- Enterprise: 128 GB
- Business: 128 GB
- Home Premium: 16 GB
- Home Basic: 8 GB
Windows XP (64 bit)
- Professional: 128 GB
- Windows Server 2003 (64 bit)
- Datacenter SP2: 2 TB
- Enterprise SP2: 2 TB
- Standard SP1: 32 GB
- Datacenter R2: 1 TB
- Enterprise R2: 1 TB
- Standard R2: 32 GB
- Small Business Edition: 128 GB
Windows Server 2008 (64 bit)
- Datacenter: 2 TB
- Enterprise: 2 TB
- Standard: 32 GB
- Web Server: 32 GB
Windows Server 2012 (64 bit)
- Datacenter: 4 TB
- Standard: 4 TB
- Essentials: 64 GB
- Foundation: 32 GB
- Storage Server 2012 Workgroup: 32 GB
- Storage Server 2012 Standard: 4 TB
- Hyper-V Server 2012: 4 TB
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