At 4K, CF Furies actually beat out SLI Titans/980Ti, the (lack of) amount of Vram on the Fury X is negligible as the gigantic bandwidth of HBM more than makes up for that.
At 1080p or even 1440p the Fury X is rubbish compared to hell even a 970, but Fury X was designed for one thing 4K + and AMD have admitted that saying the X wasn't designed for 1080p.
If one wants 1080p or 1440p go one of the 300/980 or below series, I'd love to get a Fury X or multiples of, but I A) don't game that often and B) I won't be going 4K anytime soon so a 390X in crossfire will do me just fine.