Great job, thanks for all the calculations.
Currently on nicehash my gf970 is making $32 a month (undervolted) so it's quite on pair what we're seeing here. Would be cool to mine and accumulate some gridcoins in case of future price increase.
Anyway, following :)
That's really interesting, thanks for sharing! =)
I should probably add to the article that everything is running at stock, and could be overclocked and overvolted to increase raw yield.