Thanx for the link, I did not spot it myself as I was looking for it not in "other" but in "replacement parts".
Did some thinking.
My current display array (~2 m diagonal 5400x1920) at 90 cm is ~127 degree horizontally and ~35 degree vertically in my field of vision.
A 5x ipad 3 retina displays (~250 mm diagonal 4:3 so must be 150x200 mm, 5 of them would form ~750 x 200 mm array) would be 120 H 32 V at 360 mm or 143 H 38 V at 300 mm. The "retina" distance at that ppi should be approx 330 mm for 20/20 vision. So relatively close to your face - I'm not sure how ergonomic is it to work with something so close to your face, will the eyes get tired faster than with displays at 90 cm covering approx the same area, etc. If I ever get around to pursuing this interesting idea then I would probably order first one screen and controller and see first how sensible is the idea to put a display at 30 .. 40 cm from your face for extended period of time. Also as the screens will be relatively small it would be interesting to see if the head movements and resulting nonuniform distances to the screens would get distracting when the distance the the screen is so small. I mean at 90 cm +/- 10 cm is not a huge deal, but at third of that distance it could be already significant variation forcing eyes to refocus more often than at 90 cm.
Anyone know how large are the bezels on the ipad 3 displays ? My current displays have 20 mm so at 90 cm (2x20mm) they cover 2.5 arc degree gaps. If Ipad 3 has, say 5 mm then at 36 cm (2x 5mm) it would mean 1.6 arc degree bezels.
Edit: 3x2 eyefinity might be interesting as well if the bezels are particularly thin.
5x1 portrait: 7680x2040 (75x20 cm) (120 degree x 32 degree at 36 cm)
3x2 landspace: 6144x3072 (60x30 cm) (96 degree x 48 degree at 36 cm)
Problem with 3x2 landscape is that there is one horizontal bezel still directly in focus and it can be very annoying to have a bezel directly covering your cross-hair. With 5x1 portrait that's not such an issue as the main focus is on three middle screens with limited number of bezels potentially distracting you while two side-most screens just fill your peripheral vision. Then there is also issue that the strongest consumer card on market with 6x displayports is 7870 with only 2 GB of vRAM. Raw performance wise you can pull it off pretty decent as you can scale it up all the way to quadfire, if desired, however only 2 GB of vRAM can be problem. In my experience 1 GB of vRAM is sort of ok enough up to approx 8 megapixels and at 10 megapixels you will need to be very considering what effects you enable and what not. The 3x2 with these screens would be 18.9 megapixels so close to twice of that so as soon as you get liberal with effects you would be hitting the vRAM wall. If we would have, for example, a 7950 with 6 displayports that would be rather sweet as 3 GB would be sort of exactly "about enough" for such resolution as long as you do not use any AA at all (and at that ppi you most definitely would not need any AA at all). Unfortunately such card remains vaporware (was announced a while ago in China but still nowhere to be seen and probably will not come at all now with the next gen cards launch rumored to be in October).
Unfortunately my budget will most definitely will not allow me to start with "custom screens" at 3x2 eyefinity level. I quite recently upgraded to LGA 2011 and full 64 GB of RAM and another GFX card so that burned quite a hole into my disposable income stream for at the very least 3 (or more) upcoming months. Perhaps, if I find a cheap controller I might be able to squeeze one controller + ipad 3 display into my budget to play around a bit and see how I like it, if there is any kind of problems, how feasible is to construct a custom stand for them allowing the precise alignment of displays needed to make eyefinity pleasant, etc.
Found a nice page about driving ipad 3 screen from PC - http://emerythacks.blogspot.com/2013/04/connecting-ipad-retina-lcd-to-pc.htmlEdited by Carniflex - 7/5/13 at 1:57am