johnnyjibbs said:
...The numbers in the post quoted above don't look right to me. The G4 is much more efficient than the Pentium 4 (7 stage pipeline compared with 20) and is more efficient than even the G5. This means that a G4 should outperform a G5 slightly at the same clockspeed, and significantly outperform the Pentium 4 at the same clockspeed.
I would say that generally..
1 GHz G4 is roughly equal to a 1.3 GHz G5 and a 2.4 GHz Pentium 4.
Well, Apple considered the single processor G5 at 1.8 GHz to be ruffly equal to the previous top of the line PowerMac, the Dual G4 at 1.42 GHz
The G5 is faster than a G4 of the same clock speed.
As for the rest of the scores, this was looking at code that could be executed on all three processors. When Altivec processing was added in, the scores jumped up dramatically, but the Pentium 4 system was left out of the benchmarking.
Further, all benchmarks were single processor. Most PowerMacs in recent years have been released as dual processor systems, while the Pentium 4 can not be used in a dual processor system and requires a special license to run Windows XP on dual processor systems (like the Xeons which can run in multi processor systems).
When the scores were done where both processors on the G4 and G5 systems were in use, the scores (predictably) just about doubled.
So a dual G4/1 GHz would be ruffly the same as a Pentium 4/2.2 GHz, or a single processor G5/1.6 GHz.
Also, yes, these are floating point scores. As most real work on computers use floating point, that is, in my opinion, the only score that matters when comparing processors. Integer performance is nice for things like a work processor, but I highly doubt that the fastest integer system in the world would make you a faster typist.
I don't use Windows PCs. I guess they are nice for gaming and secretaries, but I don't see much value in them beyond that. My background is in Macs, Suns and SGIs, and the main thing those companies worried about was floating point performance.
And as I pointed out, Windows was not in use in this study. The G4s were running Mac OS X 10.2.3, the G5s were running Mac OS X 10.2.7 and the Pentium 4 systems were running Red Hat Linux 7.3. I have no doubt that a Windows PC would run slower, but this study didn't include the crippling effect of Windows on a system.
So, anyone can dispute these figures if they want, but this was the best study I've seen that attempted to bench mark these processors on a level playing field. I, personally, would have benched the systems using the altivec as enough software takes advantage of it to include a head to head comparison. But that was not how it was done, and I'm not into cooking the books when reporting the findings on someone else's work.