GDC 2013 - We're still walking the halls of the Game Developers Conference in San Francisco, where we popped by the AMD booth to check out an insane 5-screen EyeFinity setup.
What makes this stand out is that the 5 screens were running from a single Radeon HD 7970, pumping out nothing less than 8200x900. This is a weird resolution, as it means AMD are using five 1640x900 screens. I'm sure they're just using Full HD-capable screens with the resolution notched down to handle their huge pixel count in Tomb Raider using TressFX.
You can see our results with EyeFinity running a single HD 7970 and CF HD 7970s right here.