Antminer S21 vs SealMiner A3 Air
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 3500 W | 3640 W | |
| Release | 2025-09 | ||
| Best opportunity |  BTCNetwork | BTCNetwork | |
| Profit/day | $0.21 | $1.49 | |
| Score | 66/100 | 69/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.
| Algorithm | Antminer S21 | SealMiner A3 Air | |
|---|---|---|---|
| SHA-256 | 235 TH/s3878 W · 60.6 GH/s/W | 260 TH/s3640 W · 71.43 GH/s/W |