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32-bit Windows vs. 64-bit Windows

The 64-bit version of Windows requires greater system resources than the 32-bit version of Windows.  As an example, two computers with matching components and 4GB or less of RAM.  The computer running the 32-bit version of Windows will run considerably faster than the matching compuer running the 64-bit version of Windows.  This is because the 64-bit version of Windows requires more RAM in order to operate efficiently.  The 32-bit version of Windows cannot support RAM beyond 4GB.  Only the 64-bit version of Windows can support RAM beyond 4GB.  Therefore, the primary driving force for using the 64-bit version of Windows would be when you have a computer with more than 4GB of RAM.  As stated when a computer has 4GB or less of RAM, the 64-bit version of Windows will run considerably slower than the 32-bit version of Windows.  Examples of computers that would make excellent use of the 64-bit version of Windows would be High End Workstations and Servers.

As an aside, almost all software in the marketplace is 32-bit. 

Windows 7

Windows 7 Ultimate: 4 GB (32-Bit), 192 GB (64-Bit)
Windows 7 Enterprise: 4 GB (32-Bit), 192 GB (64-Bit)
Windows 7 Professional: 4 GB (32-Bit), 192 GB (64-Bit)
Windows 7 Home Premium: 4 GB (32-Bit), 16 GB (64-Bit)
Windows 7 Home Basic: 4 GB (32-Bit), 8 GB (64-Bit)
Windows 7 Starter: 2 GB (32-Bit), 2 GB (64-Bit)

Windows Vista

Windows Vista Ultimate: 4 GB (32-Bit),  128 GB (64-Bit)
Windows Vista Enterprise: 4 GB (32-Bit), 128 GB (64-Bit)
Windows Vista Business: 4 GB (32-Bit), 128 GB (64-Bit)
Windows Vista Home Premium: 4 GB (32-Bit), 16 GB (64-Bit)
Windows Vista Home Basic: 4 GB (32-Bit), 8 GB (64-Bit)
Windows Vista Starter: 1 GB (32-Bit), N/A (64-Bit)

Windows XP

Windows XP (All Versions): 4 GB (32-Bit), 128 GB (64-Bit)
Windows XP Starter Edition: 512 MB (32-Bit),  N/A  (64-Bit)

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