And overclock?! ROFL! My Fury is at 1135 MHz - I get 10% more performance. Pascal overclocks usually yield a 7% boost - WOW!
Yeah, there's usually not much point in overclocking video cards.
The only real exception is with Polaris... GPU overclocks aren't worth much alone, but memory overclocks combined with higher GPU clocks can be quite good. Still, even with that, you're only talking about 15% more performance over reference... and I consider a 30% improvement to be the smallest worthwhile improvement to consider spending money on... unless you're just at the cusp of stable frame rates or just barely outside of your monitor's FreeSync range, when even 5~10% more performance can make the difference between stutters and silky-smooth experiences.
For me, though, I usually underclock my video cards. My RX 480 is currently running 640Mhz on the core and 1Ghz on the RAM. I can play most of the simple games and do all of the normal tasks that I want - while consuming only ~35W under load (above idle usage of ~20W).
I then have three other performance presets (using Afterburner).
900/1500 - Somewhat more demanding games (Crysis [Warhead] mostly)
1000/2000 - Demanding games (BF4, Hitman [Absolution], Civ V)
1288/2150 - Seriously Demanding Games (BF1 the only one so far)
Mind you, I have to keep frame rates at or below 146Hz and above 30Hz for FreeSync, so I tune things appropriately. All of my profile have significant under-volting applied and have had a few hours, at least, of games played with them.
The 1070 is actually 2 steps below a fury x as a fury x was meant to compete with the ti model. So things are looking pretty good there.
This is expected, Pascal and Polaris both represent a double-generation jump (well, Polaris anyway... Pascal is basically just a shrunken Maxwell with clock speed improvements enough for two generations of performance increase).
The only effort this generation that should really be applauded, IMHO, is AMD's. GCN4 is ~15% faster per clock, more efficient, brings quite a bit of meaningful new tech, and still clocks 15%+ higher... the fact that it was only used on a mid-range GPU is irrelevant from a technology perspective. Pascal is just the same old stuff with a few tweaks and clock speed improvements... boring stuff, really, albeit the feat is still impressive... it's basically just teams looking for critical paths and optimizing them away.