According to Wu, Bitmain released the S21 Pro mining machine in Muscat, the capital of Oman, with a computing power of up to 234T and an energy efficiency ratio of only 15.0J/T. Customized oil-cooled mining machines can reach HEM mode, 18.5JT, 305T, and oil temperature of 30~50℃; NEM mode 16.0JT, 239T, and oil temperature of 30~40℃.