Bitmain Antminer S21+ Hyd (358Th) vs MicroBT Whatsminer M66
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21+ Hyd (358Th) | Specification | MicroBT Whatsminer M66 |
|---|---|---|
| 358.0 TH/s | Hashrate | 238.0 TH/s |
| 5,370 W | Power Consumption | 4,736 W |
| 15.0 J/TH | Efficiency | 19.9 J/TH |
| 50 dB | Noise Level | — |
| 12.8 kg | Weight | 16.0 kg |
| 18,322 BTU/hr | BTU Output | 16,159 BTU/hr |
| 44/100 | Home Mining Score | 16/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S21+ Hyd (358Th)
MicroBT Whatsminer M66
Based on BTC price of $77,338 and current network difficulty as of Apr 25, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Bitmain Antminer S21+ Hyd (358Th) wins on 5 of 6 factors (efficiency, hashrate, home mining score, noise level, price-performance). The MicroBT Whatsminer M66 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
Bitmain Antminer S21+ Hyd (358Th)Score: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21+ Hyd (358Th)15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer S21+ Hyd (358Th) or MicroBT Whatsminer M66 more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21+ Hyd (358Th) is more profitable at $-0.05/day compared to $-2.83/day for the MicroBT Whatsminer M66. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S21+ Hyd (358Th) or MicroBT Whatsminer M66?
The Bitmain Antminer S21+ Hyd (358Th) is quieter at 50 dB compared to the MicroBT Whatsminer M66 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Bitmain Antminer S21+ Hyd (358Th) or MicroBT Whatsminer M66?
The Bitmain Antminer S21+ Hyd (358Th) scores 44/100 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 Bitmain Antminer S21+ Hyd (358Th) and MicroBT Whatsminer M66?
The Bitmain Antminer S21+ Hyd (358Th) runs at 15.0 J/TH while the MicroBT Whatsminer M66 runs at 19.9 J/TH — a difference of 4.9 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.