Linked by Tony Bourke on Thu 22nd Jan 2004 21:29 UTC
Benchmarks When running tests, installing operating systems, and compiling software for my Ultra 5, I came to the stunning realization that hey, this system is 64-bit, and all of the operating systems I installed on this Ultra 5 (can) run in 64-bit mode.
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AMD64 SPECint2000 64 contra 32 Bit test
by Lightkey on Sat 24th Jan 2004 17:05 UTC

The german magazin c't did a comparison back in october 2003 with the gcc 3.3 also.
The 64 bit versions had only on 3 of 13 tests a worse result and were 6% faster in average, exactly the 64 bit versions were compared to the 32 ones:
164.gzip + 6%
175.vpr - 6%
176.gcc +16%
181.mcf - 1%
186.crafty + 4%
197.parser +10%
252.eon +25%
253.perlbmk - 1%
254.gap + 5%
255.vortex +10%
256,bzip2 + 4%
300,twolf + 1%

But the reason is probably the 16 registers instead of 8.
They say the PPC970 should be more qualified, if only there were a true 64 bit OS for it.