I recently put together a new computer build with a GTX 690 and 3 monitors ASUS PB278Q 27in IPS LED.
Setting up surround mode I can get the resolution of 7680x1440 (that's 2560x1440 x3) working great. BUT, I can't find anyway of setting up 5760x1080 (1920x1080 x3).
Obviously 5760x1080 will work a lot better for newer games (higher FPS), so it would be nice if I could get it working.
It's worth noting that the native resolution of my monitors is in fact 2560x1440 so perhaps this just isn't possible. If I go into the nVidia control panel, and set each monitor to run @ 1920x1080, and then try to turn on surround, they all still revert back to 2560x1440.
All 3 monitors are plugged into the DVI slots on the GTX 690 directly with no adapters at all. I'm not making use of the DP slot.