The antminer-s9 is a latest device that has hashing power (13.0 TH/s) and is more energy efficient then the old models. It only uses 1273 watts at the time of operation or in the process of mining. Working efficiency of this model is 0.98J/GHs. Cost of this model is around $5000. The antminere-s9 is available for sale on the website www.antminere-s9.com with all its features.