The following is an excerpt from Medium.
Given the current difficulty, and the rate of increase of difficulty in finding BTC blocks, it now makes more sense to simply speculate on the currency than it does to mine it with consumer “plug-and-play” hardware.
Recently, Cointerra announced (and sold out) the first batch of their TerraMiner IV, which computes BTC hashes at a rate of 2TH/s. This is by far the most efficient way to mine BTC, at a current cost of $3/GH/s.
You can get some really good background on why this is a deal in this very good, and very in-depth article on bitcoin miners.
You can continue reading Don't buy a Terraminer on Medium.
By Stefan Nagey