6x Sapphire Nitro+ RX 580 8GB with Micron memory clocked at 1170/2200MHz with 850/850mv and -20% power limit doing 192.9 mhs eth at little under 810w. Using the nanopool i get average hashrates over the reported ones. (usually, 4 out of 7 days, in the rest, really close to reported, max 10 mhs less)
PS: Check the GPUz reported consumption. 80w... Also check my highest temps which are 51 and 52* degrees celcius with the fan at only 37% in a warm room, around 25* today, for example. One last thing, no incorrect shares, not even 1 memory error reported in hwinfo, not one.

https://image.ibb.co/bygsTy/32324939_1663807277070731_5687913318526746624_o.jpg
https://image.ibb.co/euOjad/32416549_1663806050404187_7786284067036594176_n.jpg
https://image.ibb.co/hQ2cvd/32423238_1663806450404147_7487452397338361856_n.jpg

what device do you have to meassure de electrical power Huh