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Are there maximum RAM limitations for the operating system?

Operating system maximum RAM limits

Here is a breakdown of Windows operating systems.

Windows 8 limits on physical memory:

  • 32-bit Edition
    • Windows 8 = 4GB
    • Windows 8 Professional = 4GB
    • Windows 8 Enterprise = 4GB
  • 64-bit Edition
    • Windows 8  = 128GB
    • Windows 8 Professional = 512GB
    • Windows 8 Enterprise = 512GB

Windows 7 limits on physical memory:

  • 32-bit Edition
    • Windows 7 Ultimate = 4GB
    • Windows 7 Enterprise = 4GB
    • Windows 7 Professional = 4GB
    • Windows 7 Home Premium = 4GB
    • Windows 7 Home Basic = 4GB
    • Windows 7 Starter = 2GB
  • 64-bit Edition
    • Windows 7 Ultimate = 192GB
    • Windows 7 Enterprise = 192GB
    • Windows 7 Professional = 192GB
    • Windows 7 Home Premium = 16GB
    • Windows 7 Home Basic = 8GB
    • Windows 7 Starter = N/A

 

Windows Vista limits on physical memory:

  • 32-bit Edition
    • Windows Vista Ultimate = 4GB
    • Windows Vista Enterprise = 4GB
    • Windows Vista Business = 4GB
    • Windows Vista Home Premium = 4GB
    • Windows Vista Home Basic = 4GB
    • Windows Vista Starter = 1GB
  • 64-bit Edition
    • Windows Vista Ultimate = 128GB
    • Windows Vista Enterprise = 128GB
    • Windows Vista Business = 128GB
    • Windows Vista Home Premium = 16GB
    • Windows Vista Home Basic = 8GB
    • Windows Vista Starter = N/A



Windows Home Server = 4GB

Windows XP limits on physical memory:

  • 32-bit Edition
    • Windows XP = 4GB
    • Windows XP Starter = 512MB
  • 64-bit Edition
    • Windows XP = 128GB
    • Windows XP Starter = N/A



Source = Memory Limits for Windows Releases