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
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switch to vega 7 = 1800
60 less electricity / month = 30 months to equal
mhhhhhh.....
your electric per month should be $129.60 at 10 cents per kwh 30 days per month