Bitmain · 2024
Antminer S21 XP
The efficiency flagship of the air-cooled S21 line.
Hashrate270 TH/s
Efficiency13.5 J/TH
Wall power3,645 W
Coolingair
Noise~75 dB
Released2024
Energy $/day @ $0.10/kWh$8.75
The longer story
The S21 XP is Bitmain’s air-cooled efficiency flagship — the machine you buy when joules per terahash is the only line of the spreadsheet that matters and your power price makes every fraction count. It represents the current ceiling of what air cooling extracts from Bitmain’s silicon.
It suits professional operations with decent power costs that want maximum efficiency without hydro infrastructure. The premium over the standard S21 only pays back where margins are thin and uptime is long — hobbyists heat rooms just as well with cheaper units.
Quick answers
- How efficient is the Antminer S21 XP?
- The Antminer S21 XP runs at 13.5 J/TH — joules per terahash is the number that decides mining profitability. The efficiency flagship of the air-cooled S21 line.
- How much power does the Antminer S21 XP use?
- Typical wall draw is 3,645 W, which at a reference $0.10/kWh costs about $8.75 per day in electricity. Scale linearly to your own rate — the electricity price is the whole business.
- Is the Antminer S21 XP suitable for home mining?
- Only with acoustic isolation: at ~75 dB it is data-center loud. Home miners use soundboxes, sheds, or pick a quiet unit like the Avalon Mini 3 or Bitaxe.
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