You might be interested in this DDD forum discussion thread: http://www.ddd.com/forum/viewtopic.php?f=2&t=1230
, especially Jude's and my comments.
Note that I actively game using AMD's HD3D 1080p24 mode, with display, graphics driver, and Ignition software set to 1080p, 60 Hz. My Accelero XTREME cooled HD6970 has done a good job with 3D rendering rates on recent DX11 games like Crysis 2, FEAR 3, and Dragon Age 2.
However, if I were to expand to a 3D surround display(3x1), I would need to migrate to a water cooled chassis. Using current graphics hardware, a HD6990 or GTX590 scale solution is required (both cards can overheat if only air cooled). Note that AMD/DDD do not support CrossFire or either of these high end cards.
Ideally, a good (from human factors perspective) 3D surround configuration would consist of 3 interconnected 1080x1920 (portrait orientation) low energy displays. The relative widths of active (screen) and inactive (bezel and panel frame) areas would need to incorporated into the surround rendering software. DDD does not support this, and NVIDIA may not support portrait orientation.