Thanks for all the replies :)
I think I will buy 2x 7970.
The aim of this project is to build big digital signage structure, so this pc will have to have a lot of power to deal with video and flash presentations.
@suiken_2mieu:
I was checking this msi card and it looks great, but has mini display port that can output only 2560x1600, so it won't fit 2 monitors neither horizontally nor vertically :/ but asus you mentioned has 4x display port, so it should work in configuration that you proposed (4x2xhdmi) :)
@Haldi:
this asus card has 4 display ports, so all adapters would be connected to one card and from what I read at amd page 7970 can output 4k at display port, so there should be no problem :)
I think the main problem may be with power to run this 7680x2160, especially video (h.264) or flash :/
@Sh4dowking:
as I said the aim is digital signage, but I think we will also play some games on it :D
So the plan now looks like this:
- 2 (or 3?) asus HD7970-DC2T-3GD5 with crossfire
- 4 dp->2xhdmi or 2 dp->4xhdmi adapters
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