Hey there Karlitos,
I have a similar GPU setup quad 290s on a 4770K + asus extreme 6. Such beasts...love them.
Was thinking about upgrading my 5760 x 1080 setup and was really hoping to do PLP with a 40 inch 4k in the middle but looks like PLP is only enablled for the R9 285
Alternatively I was looking at 2560 x 3 and given your experience and troubles with this setup + quad..hopefully you can give me some advice.
1) How is vram usage in most games? need to turn down MSAA?
2) Did you get all your eyefinity + crossfire issues fixed with the 2560 eyefinity setup?
3) What general FPS are you getting in popular games, ex: BF4, mordor, etc at high/ultra settings?
4) Was thinking of going 3 x freesync asus 2560 monitors when they come out but our R9 290s cant do eyefinity freesync right?
5) Any other general tips?
Thanks a bunch in advance!