Ubuntu 11.04: i686 vs. i686 PAE vs. x86_64
POV-Ray, which is a single threaded test, had regressed when using the 64-bit Linux environment. The 32-bit PAE performance was indifferent to a non-PAE kernel.
Smallpt, another multi-threaded test, heavily favored 64-bit computing.
FLAC audio encoding was significantly faster in a 64-bit environment.
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