So what you are basically saying is that if you sacrifice settings it's enough. Turn off AA, reduce the detail from the max down a peg like AMD tell you do on their website and everything will be OK.
But it isn't, is it? you are sacrificing detail. You are turning things off. At this level of the market that's not acceptable, not at 1440p because Nvidia make a product (980ti) that does not come with those sacrifices.
I note you didn't do what I suggested with BLOPS III. It's not down to bugs either, once you have enough VRAM it does not happen and now at this point in time the game has been patched up to fix the early issues and runs like butter on my Titan X.
Then you go on to say "Doom is a game I don't play". That's fair enough, but the Fury X doesn't have enough VRAM for that either.
You can't even access Nightmare dude. As I said, a lot of the reason why you probably think 4gb is enough is because you obviously don't realise that certain games sniff out the VRAM and hobble themselves due to the lack of it.
With the Fury priced at around £300 here in the UK and the 980ti going for £340 or so you'd be absolutely crazy to buy a Fury card of any sort. They're crap at low resolutions too (I should know I have benched mine at 1080p and it was barely any better than a 390).