@vipvip68, thank you and the rest for the complements.
Unfortunately I do not know where to get that cable in the PI but I know their are a few post mentioning it. I'm sure the rest of the gang here will fill you in.
As far as I know Eyefinity can only run on three monitors with identical resolutions...
Three 22" = 5040x1050
Three 24" = 5760x1200
Three 30" = 7680x1600
The monitors don't have to be the same brand but you may encounter some color matching issues between them. Before I picked up the other two monitors I was running 19"-24"-19" plus my 46" HD LCD on a Sapphire 4850x2 with quad DVI outputs and that worked fine but no Eyefinity gaming.
ATI are still working on updates so I'll keep my ears open and fill you in later.
Shine