The way it works is that the card/drivers make Windows into seeing all displays as one single, large display. You do this by creating an Eyefintiy "Group" in CCC. Once you have that large resolution in Windows, then you can launch you game and select that high resolution, assuming your game will do it properly. Check the Master Games List for details on that.
I strongly suggest you use Bezel Management, which compensates for the frame around your monitors, which will give you a slightly wider res, but looks much better. I went from 5760x1200 to a compensated 6040x1200. (which those games should also see and be able to recognise)
As for the hardware itself, there's lots of info here on how to get it set up, and trouble-shooting issues. You NEED at one monitor to use the Display Port - Either by using a monitor that already has a DP connection on it, or using an ACTIVE DP-to-VGA/DVI/HDMI/whateveryouneed adapter. There's a big thread on which ones work well.
All screens have to be the same resolution, and it looks better if they match. More for the sake of color-matching than aesthetics. If you are unable to buy two more of the monitor you already have, then I'd suggest using the odd monitor out as the center.
As for performance, if you find any games running sluggish, you can can also run them in lower resolutions, like 5040x1050, or its' bezel managed counterpart - something like 5080x1050
On top of multi-display gaming sweetness, having extra monitors is REALLY handy. You can watch full-screen videos while gaming on single screen or surfing, etc., have multiple browser/document/whatever windows running and visible.. it's lovely, and you'll never go back to single.
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