Short answer- they can access more memory and more of it at a time.
Some os's let you run 32bit apps.  In linux it's irrelevant since it's compiled for your platform.
http://en.wikipedia.org/wiki/64bit



On Mon, May 10, 2010 at 22:40, mike Enriquez <mylinux@cox.net> wrote:
I would like to hear what every one thinks about 64 bit computers. What makes a 64bit computer? Is it just the OS and or does a 64bit computer need a specific kind of motherboard and cpu? Any thing else I have left out?
I am assuming that applications have to run in 64bit mode or they don't run at all.

I really would appreciate your view points.

Thanks

Mike Enriquez
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