Apple said coding should work for Intel if the code worked for the G3 PowerPC. This places the Pentium 4 used in the devloper boxes in the same class as a G3 PowerMac. Making the Pentium a third class citizan in the Mac world. This could roughly be equated as a baseline for the Mactel.
Coding for the Pentium instruction set is not the same as coding for the Pentium CPU. The instruction set can be emulated by the alpha for instance.
The Pentium, by ALL accounts is out-of-gas at 4Ghz, this isn’t a future, it the past. any new procesor will have to have either a faster, or a much wider future. 128bit anyone?
And what of the Altivec thing, such a good idea should not go to waste