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Bitmain Antminer S21 XP vs Bitmain Antminer S23 Hydro

Comparing
two miners
Decided by
Efficiency (J/TH, lower is better)
Last reviewed
2026-08-18
Bitmain Antminer S21 XP4.4

Bitmain's most efficient air-cooled miner: 270 TH/s at 13.5 J/TH, about 10 percent less power per terahash than the next tier of fan-cooled rigs.

Bitmain Antminer S23 Hydro4.5

The efficiency benchmark at 9.5 J/TH: a 580 TH/s liquid-cooled 3U unit built for industrial racks and $0.04 power, not for home setups.

Verdict: Bitmain Antminer S23 Hydro

Bitmain Antminer S23 Hydro is the more efficient machine: 9.5 J/TH against 13.5 J/TH for Bitmain Antminer S21 XP, on the rated watts and nominal hashrate each maker publishes.

Criterion
Efficiency (J/TH, lower is better)
Bitmain Antminer S21 XP
13.5 J/TH
Bitmain Antminer S23 Hydro
9.5 J/TH

Bitmain Antminer S21 XP and Bitmain Antminer S23 Hydro, fact by fact

Every row is from the two reviews as of their review dates, with sources on each. A check marks the side a decidable criterion favours; rows without one are information, not a score.

Bitmain Antminer S21 XP and Bitmain Antminer S23 Hydro compared fact by fact from their reviews; a check marks the side a decidable criterion favours.
FactBitmain Antminer S21 XPBitmain Antminer S23 Hydro
Efficiency13.5 J/TH9.5 J/TH (favoured on this row)
Editorial rating4.44.5
Hashrate270 TH/s580 TH/s (3U unit); larger hydro units reach 1,160 TH/s
Power draw3,645 W5,510 W
Street price$3,800 to $5,500$16,500 to $29,800
Price per TH/s (midpoint)$17.22 (favoured on this row)$39.91
CoolingAirHydro (liquid loop)
Noise75 dBVery low, liquid loop
ReleasedOctober 2024January 2026
Made byBitmainBitmain
Best forHome and small operations that want flagship efficiency without running a water loopIndustrial and data-center operations chasing the lowest J/TH on the market
Last reviewed2026-08-182026-08-18

Frequently asked questions

Is Bitmain Antminer S21 XP or Bitmain Antminer S23 Hydro more efficient?

Bitmain Antminer S23 Hydro is the more efficient machine: 9.5 J/TH against 13.5 J/TH for Bitmain Antminer S21 XP, on the rated watts and nominal hashrate each maker publishes. Efficiency is derived from the record's rated watts and nominal hashrate and never stored, so it cannot disagree with the numbers beside it.

Which is better value, Bitmain Antminer S21 XP or Bitmain Antminer S23 Hydro?

Bitmain Antminer S21 XP, at $17.22 per TH/s against $39.91, on the midpoint of each street-price band (Bitmain Antminer S21 XP $3,800 to $5,500, Bitmain Antminer S23 Hydro $16,500 to $29,800) as of the review dates. A cheaper terahash that burns more power costs more over a year at most electricity prices.

Which is quieter, Bitmain Antminer S21 XP or Bitmain Antminer S23 Hydro?

Bitmain Antminer S21 XP: 75 dB, air cooling. Bitmain Antminer S23 Hydro: Very low, liquid loop, hydro (liquid loop) cooling. Neither belongs in a room people use; the mining hub covers where each can actually run.

Which is newer, Bitmain Antminer S21 XP or Bitmain Antminer S23 Hydro?

Bitmain Antminer S23 Hydro, released January 2026, against October 2024 for Bitmain Antminer S21 XP.

The full reviews: Bitmain Antminer S21 XP and Bitmain Antminer S23 Hydro, each with its sources, and every miner we review.

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