Eyefinity on HD 5700/5800 Series - 3 monitors setup [duplicate]

"To establish Eyefinity on three monitors you can only do this to use DisplayPort connection. You can connect on DisplayPort only a native DisplayPort monitor or DVI/HDMI/VGA monitor with ACTIVE DisplayPort adapter.

Picture of active adapter.

All credits should go to the Snark, since he gave the crucial hint."