AMD scale much better than nVidia. And tbh if you're planning on multi-gpu with either card, you're probably running 4k - at which the Fury X is better than the Ti anyway -- so it's a double whammy with better base performance and then better scaling on top.
No, the Ti is still better at 4k, it's just at that resolution the FuryX is very very close.
The multi-GPU results sees,s all over the place TBH. The Furies do seem do scale well in some Games but then we have people like Kapp who has 4 tXs and 4 FuryX's and claims the Titans are much better.
the problems with FuryX in crossfire for 4K is you will hit the 4Gb VRAM limit much more easily.