How much faster is a 64bit CPU than 32bit CPU? [closed]

Posted by W.N. on Super User See other posts from Super User or by W.N.
Published on 2011-11-12T14:43:18Z Indexed on 2011/11/12 17:55 UTC
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64-bit

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cpu

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32-bit

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benchmarks

I just need the result in theory. I'm not an expert in computer architecture, just a software developer.

Most of my friends think 64bit-CPU is 2 times faster than 32bit-CPU. But I think 64-CPU is 2 ^ 2 = 4 times faster than 32bit-CPU (in theory).

Which is the right answer to this question? And, if there were 128bit-CPU, how many times would it faster than a 32bit-CPU?

PS: I searched with Google, and found a link that referred to benchmarks that supported my answer.

I've seen a benchmark where 64bit was 4x faster but that was with a particular encryption where the extra registers available made the difference

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