S19j vs A21
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 3100 W | 1800 W | |
| Release | 2021-01 | 2025-01 | |
| Best opportunity |  BTCNetwork |  NEXNetwork | |
| Profit/day | $-2.19 | $2.94 | |
| Score | 56/100 | 67/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.