The Antminer S21 Hydro from Bitmain represents a significant advancement in Bitcoin mining technology, emphasizing both efficiency and performance. With a hash rate of up to 319TH/s and an energy efficiency rating of 16 J/TH, the Antminer S21 Hydro showcases substantial progress. Developed in collaboration with TSMC and equipped with state-of-the-art 5-nm chips, this model offers up to a 40% improvement in efficiency compared to its predecessors, the S19 series. This highlights Bitmain's continued dedication to enhancing mining hardware for superior performance and reduced power consumption.