Ubuntu: 32-bit v. 64-bit Performance
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| Looking over the results 64-bit Ubuntu was able to provide a strong
| advantage in the GCC benchmarks with both LAME and the Linux 2.6.19
| kernel compilation. However, a slight advantage had remained with
| both Unreal Tournament 2004 and the LAME encoding tests in a 32-bit
| environment. Outside of the i386 and x86_64 analysis, it is also
| worth noting that at this time there are no real speed increases
| between Edgy Eft and Feisty Fawn; however, this was only the first
| Alpha (Herd) release of many to come before the April 2007 release
| of Ubuntu 7.04.
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http://www.phoronix.com/scan.php?page=article&item=616
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