i wanted to mine eth too ,i have an old gaming pc with 1 nvidia 1070. But after reading this topic the idea looks like complete waste of time 
What? You can mine with gtx1070, it will make sense if you have free electricity but if you don't it's still good, presently you can earn up to 5$ mining Pegascoin with a single gtx1070, how is that a waste of time? Pegascoin is a new altcoin that use Ethash Algorithm just like ETHEREUM, right now it's very profitable