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> who will sell me a GPU with three DisplayPorts to drive three of these?

Visiontek makes a couple of eyefinity cards with 6 mini-dps. I didn't see the measurements but it doesn't look too long.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814129...

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I so want to believe you're right, but I don't see anything on that page that suggests those DisplayPorts can drive 3840x2160. The footnotes imply, but do not say specifically, that 2560x1600 is the maximum resolution supported by each port. Am I wrong?

I'm not sure what resolutions it supports. Looking at it again it seems like a 2560x1600 max is a safe assumption. Looks like you're stuck with full-length, double width cards for now: http://www.newegg.com/Product/Product.aspx?Item=N82E16814129...

Awesome! That fits the bill just fine since it's still just right for the board in my PC, which has a single PCI Express x16 slot. Thank you for pointing me to this!

All the 7000 series Radeons and many of the earlier ones support DisplayPort 1.2, which gives them enough bandwidth per connection to handle 4k, and the total pixel count of 3 4k displays is only slightly higher than 6x2560x1600. The 7000 series Radeons increased the maximum dimension of an Eyefinity array from 8k to 16k, so 3 4k monitors in any rectangular layout should work.

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