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.