X4-1U vs A21
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 240 W | 1800 W | |
| Release | 2021-11 | 2025-01 | |
| Best opportunity |  QKCNetwork |  NEXANetwork | |
| Profit/day | $0.24 | $3.92 | |
| Score | 64/100 | 66/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.