S9i vs A21
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 1280 W | 1800 W | |
| Release | 2018-05 | 2025-01 | |
| Best opportunity |  BTCNetwork |  NEXNetwork | |
| Profit/day | $-1.92 | $4.81 | |
| Score | 49/100 | 69/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.