Antminer S21 Hydro vs SealMiner A4 Pro Air
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 5360 W | 3662 W | |
| Release | 2024-02 | 2026-05 | |
| Best opportunity |  BTCNetwork | BTCNetwork | |
| Profit/day | $4.02 | $6.88 | |
| Score | 72/100 | 77/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.
| Algorithm | Antminer S21 Hydro | SealMiner A4 Pro Air | |
|---|---|---|---|
| SHA-256 | 319 TH/s4785 W · 66.67 GH/s/W | 336 TH/s3662 W · 91.75 GH/s/W |