If Fury uses a decent amount less power than the 980Ti, then a 6/8pin setup should give Fury plenty of room.
980ti is listed at 250W but we have 75W slot + 75W 6-pin + 150W 8-pin or 300W total available to the Ti card.
So, Ti theoretically already has some power overhead.
But there is literally no other way to get 250W.
75W slot + 2x 6-pin = 225W
75W slot+ 1x8-pin = 225W
Slot + 1x6-pin + 1x8-pin is the only way to get 250W and it overshoots to give 300W.
The fact that Fury is 75W slot + 2x 8-pin (375W total) is indicative of the potential to use a lot of power, significantly more than the 980 Ti as the adaptors have a lot of headroom (295x2 has 2x 8 pin but uses quite a bit more power than 375W).