Canaan AvalonMiner 821 vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Canaan AvalonMiner 821 | Specification | Whatsminer M66S |
|---|---|---|
| 11.5 TH/s | Hashrate | 298.0 TH/s |
| 1,200 W | Power Consumption | 5,518 W |
| 104.4 J/TH | Efficiency | 18.5 J/TH |
| — | Noise Level | 50 dB |
| 4,700.0 kg | Weight | 13.5 kg |
| 4,094 BTU/hr | BTU Output | 18,827 BTU/hr |
| 31/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Canaan | Manufacturer | MicroBT |
Profitability Comparison
Canaan AvalonMiner 821
Whatsminer M66S
Based on BTC price of $70,231 and current network difficulty as of Mar 24, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Whatsminer M66S wins on 5 of 6 factors (efficiency, hashrate, home mining score, noise level, price-performance). The Canaan AvalonMiner 821 holds the edge in power consumption. 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
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 Canaan AvalonMiner 821 or Whatsminer M66S more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Canaan AvalonMiner 821 is more profitable at $-2.53/day compared to $-4.17/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 Canaan AvalonMiner 821 or Whatsminer M66S?
The Whatsminer M66S is quieter at 50 dB compared to the Canaan AvalonMiner 821 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Canaan AvalonMiner 821 or Whatsminer M66S?
The Whatsminer M66S scores 44/100 on our Home Mining Score (vs 31/100 for the Canaan AvalonMiner 821). 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 Canaan AvalonMiner 821 and Whatsminer M66S?
The Canaan AvalonMiner 821 runs at 104.4 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 85.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.