When I say "the S21 costs $7", I mean $7 per terahash. The unit actually costs $1.400. Dollars per terahash is how the industry compares ASIC prices. You take the total price and divide by the hashrate. Simple. But there is a better metric. If you also factor in the efficiency of the machine, you get a number that accounts for both price AND operating cost. An M70 at 14,5 J/T versus an S21 XP at 13,5 J/T might look similar on price per terahash, but the efficiency-adjusted metric shows you exactly what premium you are paying for that extra joule per terahash. The cheapest machine per terahash is not always the cheapest machine to run. 🎬 Full breakdown: https://www.youtube.com/watch?v=d0W9DCEqCws