EyeFinity will work fine with that setup. The only thing it will do is change the 1920x1200 resolution to 1920x1080 so it matches the other two. Basically, it sets all monitor resolutions to the lowest common denominator. I was running a 1920x1080 and two 1680x1050 and it simply set them all to 1680x1050 and worked great. I just didn't like the mild distortion that running my 1080p monitor in 1680x1050 looked like so I upgraded all of them to 1080p.