An Asic that consumes 7W/GHs still generates about 6 times the btc that it will cost to power it.
So there still a long way before you start mining at a loss. Long in BTC time of course
So there still a long way before you start mining at a loss. Long in BTC time of course
By my count, at current difficulty and with a power cost of 0.06 USD/kWh, the cost of generating one BTC is about 3.80 USD. That means it earns around 36x the cost to power it.