Re: aiming to 3x eyefinity
I strongly recommend 3 identical monitors, but you can get by with 3 not-identical monitors as long as they are all the same resolution. Eyefinity requires that all monitors in a group be the same resolution. If one monitor is smaller than the others, the lowest resolution that all monitors support is used, causing a blurry picture (and possibly stretched depending on aspect ratio) on the larger resolution monitors. If the colors aren't the same it can be annoying as well. I have three Dell ST2210's for Eyefinity and one of them needed to be replaced. The replacement was from a different production run and was different enough to have a noticeable color difference. I tuned it out with the color settings on the monitor as best I could but even for 3 of the same model color can be a problem.