Bitmain Antminer S21 Immersion (301Th) vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21 Immersion (301Th) | Specification | Whatsminer M66S |
|---|---|---|
| 301.0 TH/s | Hashrate | 298.0 TH/s |
| 5,569 W | Power Consumption | 5,518 W |
| 18.5 J/TH | Efficiency | 18.5 J/TH |
| 50 dB | Noise Level | 50 dB |
| 17.2 kg | Weight | 13.5 kg |
| 19,001 BTU/hr | BTU Output | 18,827 BTU/hr |
| 44/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S21 Immersion (301Th)
Whatsminer M66S
Based on BTC price of $70,862 and current network difficulty as of Mar 25, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Bitmain Antminer S21 Immersion (301Th) wins on 3 of 4 factors (efficiency, hashrate, price-performance). The Whatsminer M66S 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
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer S21 Immersion (301Th)18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer S21 Immersion (301Th) or Whatsminer M66S more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Whatsminer M66S is more profitable at $-4.09/day compared to $-4.12/day for the Bitmain Antminer S21 Immersion (301Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S21 Immersion (301Th) or Whatsminer M66S?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the Bitmain Antminer S21 Immersion (301Th) or Whatsminer M66S?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
What is the efficiency difference between Bitmain Antminer S21 Immersion (301Th) and Whatsminer M66S?
The Bitmain Antminer S21 Immersion (301Th) runs at 18.5 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 0.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.
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