Running a mix of 10 1070s and 1080s, mostly EVGA. 1070 gets 26 mhs @ 106w. 1080 getting 32 mhs @ 118w. There are more efficient cards. 1660 Super if you are in a pinch.
1070 sucks if all it can output is 26MH at 106w, are you sure this info is accurate? 106watts for 26MH is too high this isn't good for the average miner that pays the electricity bill, a low end gtx 1660 can do 27MH and take only 50-70watt depending on silicon lottery luck.
This is a real hashrate, because Nvidia did not fix the problem of lowering the hashrate when increasing the DAG file. Therefore, the Ethereum hash rate will drop for 1000 series video cards. But now they are not bought by new miners, mostly these video cards are used by old miners.
AMD solved the problem with 480 and 580 video cards, so there are even now 30 megahash.