12x Vega 56 Rig = 24KHs cryptonight = 500MHs ETH / 1800W = 120 electricity month (10cents/kwh)
6x Vega 7 = maybe 24KHs cryptonight = +-600MHs ETH / +-900W?! = 60 electricity month (10cents/kwh)
prices
sell 12x Vega 56 = 2700
buy 6x Vega 7 = 4500
------------------------------------
switch to vega 7 = 1800
60 less electricity / month = 30 months to equal
mhhhhhh.....
So, can you really sell each vega for 350 dollars? I myself would never pay that much for it, in my book vega 14nm is worth only $200.