c't heeft benchmarks van een 450MHz G4 gepost en vergelijkt 'm o.a. met een PIII-500 en Athlon 750. Laat ik maar meteen het commentaar van JC rippen, da's wel interessant (en bovendien engels, duits leest niet echt relaxed):
Neat. c't put a G4 running at 450MHz through their heavy floating point pain tests. In Cinema 4D (an insane 3D raytracer) The G4-450 scored 6, well ahead of the PIII-500, which scored a 4.84 (for you "clock for clock" people, that's .0133 points per MHz for the G4 and only .0097 for the PIII). The 750MHz Athlon in their tests scored 9.77 (again for you ipc folk, that's .0130 points per MHz for the K7). Thanks to Armand Hirt for pointing me in this direction.
BTW, note that depending on the linearity of the app, ipc may drop as clock speeds go up, so at 750MHz, both the G4 and the PIII might be slower per clock than their 450/500 scores. Of course, mind you, the 7xxMHz version of the PIII contains more efficient cach, this might cause its ipc to go up a little. Also, by the time G4 hits 750MHz, it will likely have an added decoder and execution unit, which may increase its ipc (on the other hand, that "G4+" also has a deeper pipeline, which can drop ipc -- the two effects may cancel each other out).
Interestingly enough, these numbers seem to strongly agree with the specfp numbers so far advertised by Motorola, Intel, and AMD.