How many 1080? What's the speed of a single 1080 please?
With CryptoDredge miner for single GTX1080 I get from 10.5 Mh/s to 11.5 Mh/s at consumption 160-180W depending on GPU model (Palit Gamerock Premium GTX1080 is the best for me)
Way tooo high power consumption. You get 64.7khash/Watt while I get 75.7. Regardless of algo and miner 65% tdp is the best for 1080.
I have 8 kind of 1080s but I use the same settings for all. For some algos there are significant differences between my cards.