AMD just made bold statements about Zen, namely, it will compete with Intel "not only on price" but also on "performance, power". They plan to get into "elitbooks" and "XPS" and something from (fucking) Lenovo too.
Those are direct comments by John Taylor (corporate VP AMD), not wccft speculations. (but sure, either way should be taken with a grain of salt
)
http://wccftech.com/amd-zen-competes-intel-performance-features-price-launching-2016/
970 = 21.7fps / 191W = 0.11361256544502617801047120418848
1070 = ~35.26fps / ~147.2W = ~0.23953804347826086956521739130435 <= my educated guesses, take with grain of salt.
To me it looks more like +110%, not 75%. Time will tell if my predictions are also correct or not.
compared to 980 yes 75% ... approx/averages to 2x.
To get result of some value, you should not be cherry picking games (there are counterexamples with 0% improvements too, e.g. project cars), but rather overalls.
When compared to another single GPU the GTX 1080 , even with NO OC, spanks their ass every time.
Let me spoil it for ya:
1) 980Ti's easily hit 1400-1500 Mhz. That's 50% OC.
2) OCed 980Ti is rather close to 1080, for (thank you, nZilla, do moar, please, these dudes with G-Sync monitor deserve even moar).
3) 980Ti are dumped en mass, cards can be had for about 400$. Where do you get with 699$/789Euro (fuck you, nZilla) 1080 vs that?
4) Most reviewers were able to OC 1080 for only 12% of stock, so it ain't that good.
5) +8-15 fps at 4k is hardly "spanking", no matter how you spin it.