MicroBT Whatsminer M21S vs MicroBT Whatsminer M66
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21S | Specification | MicroBT Whatsminer M66 |
|---|---|---|
| 56.0 TH/s | Hashrate | 238.0 TH/s |
| 3,360 W | Power Consumption | 4,736 W |
| 60.0 J/TH | Efficiency | 19.9 J/TH |
| — | Noise Level | — |
| 12,500.0 kg | Weight | 16.0 kg |
| 11,464 BTU/hr | BTU Output | 16,159 BTU/hr |
| 22/100 | Home Mining Score | 16/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21S
MicroBT Whatsminer M66
Based on BTC price of $70,848 and current network difficulty as of Mar 25, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the MicroBT Whatsminer M66 wins on 2 of 5 factors (efficiency, hashrate). The MicroBT Whatsminer M21S holds the edge in power consumption and home mining score and price-performance. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
MicroBT Whatsminer M21SScore: 22/100. 0 dB noise level.
Best for Efficiency
MicroBT Whatsminer M6619.9 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the MicroBT Whatsminer M21S or MicroBT Whatsminer M66 more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT Whatsminer M66 is more profitable at $-4.06/day compared to $-6.34/day for the MicroBT Whatsminer M21S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the MicroBT Whatsminer M21S or MicroBT Whatsminer M66?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the MicroBT Whatsminer M21S or MicroBT Whatsminer M66?
The MicroBT Whatsminer M21S scores 22/100 on our Home Mining Score (vs 16/100 for the MicroBT Whatsminer M66). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
What is the efficiency difference between MicroBT Whatsminer M21S and MicroBT Whatsminer M66?
The MicroBT Whatsminer M21S runs at 60.0 J/TH while the MicroBT Whatsminer M66 runs at 19.9 J/TH — a difference of 40.1 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.