MicroBT Whatsminer M21 vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21 | Specification | Whatsminer M66S |
|---|---|---|
| 31.0 TH/s | Hashrate | 298.0 TH/s |
| 1,860 W | Power Consumption | 5,518 W |
| 60.0 J/TH | Efficiency | 18.5 J/TH |
| — | Noise Level | 50 dB |
| 7,150.0 kg | Weight | 13.5 kg |
| 6,346 BTU/hr | BTU Output | 18,827 BTU/hr |
| 28/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21
Whatsminer M66S
Based on BTC price of $74,343 and current network difficulty as of Mar 16, 2026. Actual results vary.
Verdict
Based on specs, the Whatsminer M66S offers 69% better efficiency at 18.5 J/TH compared to the MicroBT Whatsminer M21 at 60.0 J/TH. This directly impacts daily operating costs and long-term profitability.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
Whatsminer M66SScore: 44/100. 50 dB noise level.
Best for Efficiency
Whatsminer M66S18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the MicroBT Whatsminer M21 or Whatsminer M66S more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT Whatsminer M21 is more profitable at $-3.47/day compared to $-3.64/day for the Whatsminer M66S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the MicroBT Whatsminer M21 or Whatsminer M66S?
The Whatsminer M66S is quieter at 50 dB compared to the MicroBT Whatsminer M21 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the MicroBT Whatsminer M21 or Whatsminer M66S?
The Whatsminer M66S scores 44/100 on our Home Mining Score (vs 28/100 for the MicroBT Whatsminer M21). 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 M21 and Whatsminer M66S?
The MicroBT Whatsminer M21 runs at 60.0 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 41.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.