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A 64-bit OS (in concert with a 64-bit processor) will be able to run 64-bit applications (applications written to take advantage of 64-bit OS's & CPU's)

The catch is, there arent any 64-bit applications on the market as yet, so you arent likely to see any advantage until such time as one is released.

Having a 64-bit OS would also mean you would be able to fit up to 16GB RAM memory that would be recognized by Windows XP/Vista.

By far the greatest potential advantage of a 64 bit OS is the vastly increased virtual address space. In 32 bit Windows all processes have a private 2GB virtual address space. This is totally independent of RAM size. In 64 bit Windows, when running native 64 bit applications, this address space increases to 8192GB, again totally independent of RAM size. For applications using large databases, video editing, etc., this is a MAJOR advantage, even if you have only 4GB RAM.

Another advantage is the ability access more RAM. In some server editions this may be as high as 2048GB. That is larger than what is currently commercially available.

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