Maximum RAM for various Windows flavors

Here’s a list of how much RAM the various Windows versions and editions support. This is from HERE which is referenced from THIS MS KB article.

  • Windows NT 4.0: 4 GB
  • Windows 2000 Professional: 4 GB
  • Windows 2000 Standard Server: 4 GB
  • Windows 2000 Advanced Server: 8GB
  • Windows 2000 Datacenter Server: 32GB
  • Windows XP Professional: 4 GB
  • Windows Vista: 4GB
  • Windows Server 2003 Web Edition: 2 GB
  • Windows Server 2003 Standard Edition: 4 GB
  • Windows Server 2003 Standard Edition SP1: 4 GB
  • Windows Server 2003 R2 Standard Edition: 4 GB
  • Windows Server 2003 Enterprise Edition: 32 GB
  • Windows Server 2003 Enterprise Edition SP1: 64 GB
  • Windows Server 2003 R2 Enterprise Edition: 64 GB
  • Windows Server 2003 Datacenter Edition: 64 GB
  • Windows Server 2003 Datacenter Edition SP1: 128 GB
  • Windows Server 2003 R2 Datacenter Edition: 128 GB