Antminer S9 (13.5Th) vs A21
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 1323 W | 1800 W | |
| Release | 2017-09 | 2025-01 | |
| Best opportunity |  BCHNetwork |  NEXNetwork | |
| Profit/day | $-2.08 | $0.72 | |
| Score | 49/100 | 60/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.