[hamei]

how to setup Xinerama for 2x V8 Gfx Cards ...

There must be a chkconflig flag called xinerama that can be turned on but in my system 6.5.26 there is no.

So am about to update to 6.5.30 but wich package contains this ?

As I remember, xinerama under Irix is not that great and has problems. If you want to use two graphics cards, I think you want to use OpenGL Performer. There was another method as well but it didn't run OpenGL apps on both screens, just one. So Performer is the better method. Recondas wrote this up at length but alas, that was on nekochan.