Bitmain Antminer S21 Series

What the generation covers

Bitmain rates the air-cooled S21 at 200 TH/s and 17.5 J/TH, the S21+ at 216 TH/s and 16.5 J/TH, the S21 Pro at 220, 234 or 245 TH/s and 15 J/TH, and the S21 XP at 270 TH/s and 13.5 J/TH. The S21 and S21 Pro tables list a 220–277 V input.

Immersion: the S21 Imm. and S21 XP Imm. run in a Normal Energy Mode (NEM) or High Energy Mode (HEM): 215 or 301 TH/s at 16.0 or 18.5 J/TH, and 300 or 380 TH/s at 13.5 or 15.0 J/TH, on 380–415 V three-phase.

Hydro: from the S21e Hyd. (288 TH/s, 17 J/TH) to the S21 XP+ Hyd. (480 or 500 TH/s at 11 J/TH, the lowest listed). The U3S21EXPH is a 900 × 482.6 × 130 mm hydro unit rated 860 TH/s on 11,180 W (13.0 J/TH); Bitmain's deployment post places it in the S21 XP series.

How the versions differ

Air-cooled efficiency improves from 17.5 J/TH (S21) through 16.5 and 15 to 13.5 J/TH (S21 XP); in immersion, HEM adds hashrate at a higher J/TH.

Announcement

Bitmain announced the S21 and S21 Hyd. at WDMS 2023, the S21 XP Hyd. at WDMS 2024 in Las Vegas (17–18 June 2024) and the S21+ series at Bitcoin Amsterdam (9–10 October 2024).

Choosing within the Antminer S21 generation

Models in one generation share a chip platform but differ in cooling type, hashrate and efficiency. Start with the cooling type your site supports, then compare efficiency and power draw between the versions listed above. Use the compare checkboxes to put two to four models side by side.