> Why is so important faster CPU or GFX card, do we have any game
> or program which need more than G4 CPU.

Just one example that is relevant to me: watching HD video content. My 1.5 GHz G4 can't cope with 1080p at all and sometimes not even with 720p properly (depending on encoding and bitrate).

> I don't mean emulators like DosBox or UAE where faster CPU is always better.

And what if that's important to someone? In that case I think you answer your own question.

> We have only old Quake3

We have also newer FreedroidRPG, UFO: AI and other games, which struggle on my 1.5 GHz G4 with full effects and resolution enabled.

> What if X1000 will have 3GHz x 6 CPU with 1+ GB high end GFX card???
> What we can do with such powerful hardware?

Watching 1080p video content for instance. But I guess that one 1.8 GHz core of PA6T is sufficient for this :-)

> count fps in Quake3 and say Os4 is better than Mos

OS4 on X1000 being faster than MorphOS on G4 Mac wouldn't mean that OS4 is better than MorphOS. It would not even mean that OS4 is faster than MorphOS. To be able to draw such a conclusion both OS would have to be run on the very same hardware (see both OS4 and MorphOS on Pegasos II benchmarks where MorphOS destroys OS4).

> I am more than happy with MacMini and Mos2.5.

Me too. But I would be lying if I said that there're no restrictions I would like to see overcome (see HD video content for instance).

> For available software more than enough.

Clearly depends on your needs and wants. What's enough for you might not be enough for someone else.