4 x 1070 are far better because of density and because mining with cheap gpu is not that good now with this high reward i would choose 2 x 1080ti over the 1070, they are even better
just thank you for your answer,
so do you think its better to go with 2x1080ti for now?
also which edition is better for those cards?
also i've checked at nicehash calc and 1x1080ti is doing only 8.21 USD/Day when 1x1060 6gb does 4USD (6x4=24USD/Day) hmmm...
2x 1080 ti is equal to cheaper energy compared to 6 x gtx 1060 gb. However 4 x gtx 1070 is also cheaper than 6 x gtx 1060 6gb but the 4 x gtx 1070 make a bit more than 6 gtx 1060 with a bit of overclocking so they make about 27-28 usd daily and cheaper energy cost. As I already said above this card is now the new golden standard for mining in my opinion and every new rig I intend to build will be based on GTX 1070-s.