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Why is it considered to be such a big deal to have a 64-bit computer? Why does it "change everything?" Why do applications need to be designed differently between 32- and 64-bit platforms?

And, on OS X, how do you find which one you have!?

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merged by Sathya Jun 6 '11 at 11:02

this question was merged with 32-bit vs. 64-bit systems because it is an exact duplicate of that question.

migrated from stackoverflow.com Jun 5 '11 at 16:39

This question came from our site for professional and enthusiast programmers.

    
@Moab; Alas, we have dozens of duplicates by now! –  Phoshi Jun 5 '11 at 16:47
    
possible duplicate of 32-bit vs. 64-bit systems –  Phoshi Jun 5 '11 at 16:47

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