Antminer S21 vs Whatsminer M63S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 | Specification | Whatsminer M63S |
|---|---|---|
| 200.0 TH/s | Taux de hachage | 390.0 TH/s |
| 3,500 W | Consommation électrique | 7,215 W |
| 17.5 J/TH | Efficiency | 18.5 J/TH |
| 75 dB | Niveau de bruit | 50 dB |
| 14.6 kg | Weight | 28.0 kg |
| 11,942 BTU/hr | BTU Output | 24,618 BTU/hr |
| 36/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Antminer S21
Whatsminer M63S
Based on BTC price of $73,643 and current network difficulty as of Mar 17, 2026. Actual results vary.
Verdict
Bitmain's flagship S21 versus MicroBT's latest M63S. The two mining hardware giants compete for the title of best current-generation air-cooled Bitcoin miner.
Both are competitive on specs. The S21 benefits from Bitmain's dominant ecosystem — parts, repairs, firmware community, and resale market. The M63S may offer a slight efficiency edge but trails in ecosystem support.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
Whatsminer M63SScore: 44/100. 50 dB noise level.
Best for Efficiency
Antminer S2117.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Whatsminer M63S more efficient than the Antminer S21?
The M63S and S21 trade blows on efficiency depending on specific batches and firmware versions. Any efficiency difference is typically within 5%, making ecosystem support and price the deciding factors.
Which manufacturer has better firmware support?
Bitmain's firmware ecosystem is more mature with more third-party options (including D-Central's DCENT_OS for supported models). MicroBT's firmware is reliable but offers fewer customization options.