I reinstalled ubuntu with all 5 cards plugged into it and then using this guide:

http://forum.bitcoin.org/index.php?topic=9239.0;all

After installing the ATI 11.6 Dirver and rebooting I received a message onscreen that my system doesn't have sufficient hardware and that Unity will be disabled and ubuntu classic will be used.

Now, the system is almost non responsive, mouse flickering, can't start any programs, like a super slowmotion.