This leaves me with another question though. When you say "Adapter" i get confused, because i thought that is just needed a straight cable with mini-dp to dp?
You're welcome.
It 'adapts' the mini display port to display port. It's a straight through cable, it does nothing more that adapt one size to the other.
A list of AMD approved adapters can be found here > http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx but any mdp/dp plug will do.