At the 2023 World Digital Mining Summit in Hong Kong, Bitmain showcased its latest rigs from the Antminer S21 series. One machine employs hydro mining, and the other is air-cooled. The S21 Hyd achieves up to 335 TH/s with an efficiency rating of 16 J/T. In contrast, the air-cooled S21 miner delivers up to 200 TH/s and has an efficiency rating around 17.5 J/T. The Bitmain announcement comes after Canaan introduced its new Avalon miners. However, only one of them, the liquid cooling machine, has a 19.5 J/T efficiency, while Canaan’s air-cooled miner reaches 21.5 J/T. Additionally, competitor Microbt aims to launch a machine with an efficiency under 20 J/T. Bitmain’s newest hydro-cooled rig contends with Microbt’s hydro-cooled M53S++ in hashrate.