SealMiner A4 Ultra Hydro vs Whatsminer M21
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 8372 W | 1860 W | |
| Release | 2026-05 | 2019-08 | |
| Best opportunity |  BTCNetwork |  BCHNetwork | |
| Profit/day | $21.88 | $-2.36 | |
| Score | 79/100 | 49/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.
| Algorithm | SealMiner A4 Ultra Hydro | Whatsminer M21 | |
|---|---|---|---|
| SHA-256 | 886 TH/s8372 W · 105.8 GH/s/W | 31 TH/s1860 W · 16.67 GH/s/W |