I have a number of rigs.

6 x Sapphire RX480 = 1100W = 1800 hash
6 x 1070 = 1150W = 2700 hash

Just that the 1070 cost more but save a little bit of electricity in the long run

I have another rig 2 x 1070, 3 x 1080ti, 1 x 980ti = 1600W = 3600ish hash

No mods nothing. Everything stock with no overclocks