L21 vs WhatsMiner M66S
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 950 W | 5513 W | |
| Release | 2018-01 | 2023-11 | |
| Best opportunity |  LTCNetwork |  BTCNetwork | |
| Profit/day | $-1.78 | $1.76 | |
| Score | 49/100 | 68/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.