> i heard that os4 use two processor

It doesn't.

> a graphics card more recent (quake 4 for example)
> morphos
> only 1 processor
> old graphic card (Doom 3 )

Considering that Doom 3 is from 2004 and Quake 4 is from 2005, and the latter uses just a slightly enhanced version of the former's engine, I'm not sure those examples really convey what you intended ;-)