Whatsminer M21 vs SealMiner A4 Ultra Hydro
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 1860 W | 8372 W | |
| Release | 2019-08 | 2026-05 | |
| Best opportunity |  BTCNetwork | BTCNetwork | |
| Profit/day | $-2.24 | $22.08 | |
| Score | 49/100 | 79/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.
| Algorithm | Whatsminer M21 | SealMiner A4 Ultra Hydro | |
|---|---|---|---|
| SHA-256 | 31 TH/s1860 W · 16.67 GH/s/W | 886 TH/s8372 W · 105.8 GH/s/W |