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Bitmain Antminer S21 Pro vs Bitmain Antminer S21 XP

Comparing
two miners
Decided by
Efficiency (J/TH, lower is better)
Last reviewed
2026-08-18
Bitmain Antminer S21 Pro4.0

The default pick for buyers with cheap power: 234 TH/s air-cooled at 15 J/TH, and roughly $16 to $24 per terahash as of August 2026.

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.

Verdict: Bitmain Antminer S21 XP

Bitmain Antminer S21 XP is the more efficient machine: 13.5 J/TH against 15.0 J/TH for Bitmain Antminer S21 Pro, on the rated watts and nominal hashrate each maker publishes.

Criterion
Efficiency (J/TH, lower is better)
Bitmain Antminer S21 Pro
15.0 J/TH
Bitmain Antminer S21 XP
13.5 J/TH

Bitmain Antminer S21 Pro and Bitmain Antminer S21 XP, 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 Pro and Bitmain Antminer S21 XP compared fact by fact from their reviews; a check marks the side a decidable criterion favours.
FactBitmain Antminer S21 ProBitmain Antminer S21 XP
Efficiency15.0 J/TH13.5 J/TH (favoured on this row)
Editorial rating4.04.4
Hashrate220-245 TH/s (234 TH/s typical)270 TH/s
Power draw3,510 W3,645 W
Street price$3,800 to $5,500$3,800 to $5,500
Price per TH/s (midpoint)$19.87$17.22 (favoured on this row)
CoolingAirAir
Noise75 dB75 dB
ReleasedOctober 2024October 2024
Made byBitmainBitmain
Best forMost buyers: the strongest balance of price, hashrate and efficiency in an air-cooled unitHome and small operations that want flagship efficiency without running a water loop
Last reviewed2026-08-182026-08-18

Frequently asked questions

Is Bitmain Antminer S21 Pro or Bitmain Antminer S21 XP more efficient?

Bitmain Antminer S21 XP is the more efficient machine: 13.5 J/TH against 15.0 J/TH for Bitmain Antminer S21 Pro, 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 Pro or Bitmain Antminer S21 XP?

Bitmain Antminer S21 XP, at $17.22 per TH/s against $19.87, on the midpoint of each street-price band (Bitmain Antminer S21 Pro $3,800 to $5,500, Bitmain Antminer S21 XP $3,800 to $5,500) 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 Pro or Bitmain Antminer S21 XP?

Bitmain Antminer S21 Pro: 75 dB, air cooling. Bitmain Antminer S21 XP: 75 dB, air cooling. Neither belongs in a room people use; the mining hub covers where each can actually run.

Which is newer, Bitmain Antminer S21 Pro or Bitmain Antminer S21 XP?

Both were released in 2024 (Bitmain Antminer S21 Pro in October 2024, Bitmain Antminer S21 XP in October 2024).

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

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