If you’re running Mac OS X, you don’t need to worry about 32-bit vs 64-bit, and if you’re running Linux, you probably know this stuff already.
The Lifehacker Guide to 64-bit vs. 32-bit Operating Systems

http%3A%2F%2Flifehacker.com%2F5431284%2Fthe-lifehacker-guide-to-64%2Bbit-vs-32%2Bbit-operating-systems

Notes

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