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Can someone explain to me how 64 bit applications, a 64bit OS, and a 64 bit CPU fit together to establish how much memory is addressable by some application?
For example, how is addressable memory for an application affected if you run a 64bit application on a 64bit CPU, with a 32bit OS?
Or what about a 64bit CPU with a 64bit OS and a 32bit application?
What happens when you run a 64bit application on a 32bit CPU?
You can’t run a 64-bit application on a 32-bit CPU/OS.
A 64-bit OS running on a 64-bit processor has effectively unlimited memory. The address space is 0 to 2^64, or 18.4 exabytes.
A 32-bit application running on a 64-bit OS/processor gets the 32-bit address space, which is roughly 4GB.
More detail:
http://cnx.org/content/m13082/latest/