The card is XFX Radeon HD 5770. It has 2 DVI, 1 DP & 1 HDMI port.
Oh. OK. I thought you meant you only had 2 DVI and one DP connection off the back, because you hadn't originally mentioned the HDMI port. What you have is standard and the options I've listed apply.
Just note for each monitor you add to the setup, your video card is working to produce images for each screen, so you may have to turn down some graphics details in the game to get the performance you want on 3 screens. It will be cool to have the games spanning three screens though! Very immersive.