In a couple of weeks you can buy these 14nm cards from AMD.
Radeon 470
TDP: 110 watt
Retail Price: $159 (4gb)
Etherum classic hashrate stock clocks (23.5MHASH)
Radeon 460
TDP: 75 watt
Retail Price: $99 (2gb)
Etherum classic hashrate stock clocks (23.5MHASH)
2x 1070: $900 (52MHASH etherum classic)
9x 460: $891 (211MHASH etherum classic)
retail for 1070 is $400, don't compare retail with initial price
but anyway you need 1.5 rig for 9 gpu against 1/3 rig lol
basically for 1 full rig of 1070 you need 4.5 rig of 460, this mean that the initial investment is much much bigger than you think
the consumption is also bigger, like 2x and last but not last, they are shit on every other algo....in the end this is not a right comparison
p.s. also from where you get 211MH for the 460? it is a 128 bit card, i doubt it can reach 20MH let alone surpass it..no way, it will be 15MH so x 9 you have only 130MH-150MH maximum