Dbl HD4850 GC = Dble or 4 display on 11.2

Hi,
on a MB AliveXfire, I have two Spphyre GC with HD4850 (Radeon)

All my display have the same desktop … how/where/what do I have to do to get four independent screen (or at least 2x2)

Thks !
E.

The two GC are not linked (Xfire)

I’ve tryed with only one, but that won’t do. I still have the same thing on both display

I can’t find out if either the dble display is supported or not, or if it’s just me dumb enough not to find the right config. menu

Thks
E.

found it
needed the “ATI Catalyst control center”

done (resolved)