Were are still in the testing phase but so far we have achieved the following (at stable sustainable levels):
43 MH/s per card @ 250W per card
38 Mh/s per card @ 160W per card
the 43 MH/s with higher power consumption calculates at a profit of $415/Mo. (1.77 ETH per month).
the 38 MH/s with lower power consumption calculates at a profit of $393/Mo.
we have looked into getting lower power but the cash difference is no negligble that even if ti was a bit more profitable we’d go with higher hashing power to generate more coins early on for the compounded dinterest/growth.
We keep looking to get more MH/s but everything over 43 MH/s has shown a huge spike in power, as to wear running the fans/that heat or stress level makes us nervous.
Right now its basically has vs. durability. 38 MH/s @ 160W the cards barely blow warm air let alone hot.