I've run benchmarks on my computer comparing 64-bit povray vs. 32-bit
povray. See for yourself:

sempron 1.6 GHz 32-bit kernel, 32-bit povray, sse2
Total Time:    0 hours 34 minutes  41.0 seconds (2081 seconds)

sempron 1.6 GHz 64-bit kernel, 32-bit povray
Total Time:    0 hours 36 minutes 41 seconds (2201 seconds)

sempron 1.6 GHz 64-bit kernel, 64-bit povray gcc 3.4
Total Time:    0 hours 29 minutes 27 seconds (1767 seconds)

duron 1.6 GHz
Total Time:    0 hours 40 minutes  46.0 seconds (2446 seconds)

So there you go: a 17.7% increase in rendering time on the benchmark scene.
Of course, as others have pointed out, there probably won't be a speedup on
architectures that were 64-bit to begin with.

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