I am having a math / logic problem 
…
On first look, goal is to tune the GPUs to get the most MH per watt, but … that is not really the goal, since in theory that apparently optimum value could be something like a very low speed with very low power consumption, it is still efficient but you can earn next to nothing per month.
So how do I calculate in order to get most total profit after decreasing electricity price ? Is there a formula ? My brain is not helping