RAM Limit in Common Windows Operating System

Tables below describes the memory limits  supported by typical Windows Operating System

Windows 8 and 8.1

Version 32 bit OS (X86)  64 bit OS (X64)
Windows 8.1  Enterprise 4 GB 512 GB
Windows 8.1  Professional 4 GB 512 GB
Windows 8.1  4 GB 128 GB
Windows 8 Enterprise 4 GB 512 GB
Windows 8 Professional 4 GB 512 GB
Windows 8 4 GB 128 GB

Windows 7

Version 32 bit OS (X86)  64 bit OS (X64)
Windows 7 Ultimate 4 GB 192 GB
Windows 7 Enterprise 4 GB 192 GB
Windows 7 Professional 4 GB 192 GB
Windows 7 Home Premium 4 GB 16 GB
Windows 7 Home Basic 4 GB 8 GB
Windows 7 Starter 2 GB N/A

Windows Vista

Version 32 bit OS (X86)  64 bit OS (X64)
Windows Vista Ultimate 4 GB 128 GB
Windows Vista Enterprise 4 GB 128 GB
Windows Vista Business 4 GB 128 GB
Windows Vista Home Premium 4 GB 16 GB
Windows Vista Home Basic 4 GB 8 GB
Windows Vista Starter 1 GB N/A

 

Windows XP

Version 32 bit OS (X86)  64 bit OS (X64)
Windows XP Professional SP3 4 GB 128 GB
Windows XP Professional SP2 4 GB 128 GB
Windows XP Professional SP1 4 GB 128 GB
Windows XP Home SP1, SP2 4 GB N/A
Windows XP Starter Edition 512 MB N/A

What is the next version of windows?
Windows 10 not Windows 9. There will be no Windows 9. Expected release date for Windows 10 is mid of year 2015. Windows 10 will revert to the Start Menu design in larger scale, that is more user friendly to most user globally. You can read more about this, just Google what ever scope you like.

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