Used Antminer S9 13.5TH 16nm ASIC Miner from Bitmain

This Antminer S9 13.5TH is not only the first 16nm miner for retail use but using less than half the energy per gigahash of the S7, but it is also the most powerful miner to enter mass production . At 0.098 joules per gigahash, this was the most efficient machine available to the bitcoin mining public until the release of the S17