My first post so bare with me...
I'm 'Steve', the person in that video and spotted the question your asking, hopfully i can help a bit here.
I've decided to make the move into eyefinity myself (thats a friends setup i was using).
1st thing i've been told, make sure the monitors have the Display Port adapters, apparently these are the ones to be using when you have multi monitors running. You can get adapters as well (if needed) but better to use the normal setup type thing.
The card used for that video was an ATI 6970 as far as i'm aware.
Thinking i could start by grabbing the GFX card, then the monitors etc stopped me in my tracks... always an upgrade to do 1st :cry:
To do this i'm going to have to upgrade my power supply to something around 1000 Watts (it helps power the card and everything else in the box), i've looked into monitors which have the Display Port connections and they seem to be running at around the 200 pounds (UK prices) each. Then the next part would be the card which runs for about 200 - 250 quid.
All in all i'd be looking at approx 700 pounds worth of extras to have my own x3 monitor setup.
The only thing i can recall about that setup of my friends was i recall him mention maybe a FOV (Field Of View) setting in a file somewhere.
I'll see if i can get him to look at your post though, he might be able to help you more.