Antminer KS3 vs Bitmain Antminer S21 Immersion (301Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer KS3 | Specification | Bitmain Antminer S21 Immersion (301Th) |
|---|---|---|
| 9.4 TH/s | Hashrate | 301.0 TH/s |
| 3,500 W | Power Consumption | 5,569 W |
| 372.3 J/TH | Efficiency | 18.5 J/TH |
| 75 dB | Noise Level | 50 dB |
| 16.1 kg | Weight | 17.2 kg |
| 11,942 BTU/hr | BTU Output | 19,001 BTU/hr |
| 36/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| KHeavyHash | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer KS3
Bitmain Antminer S21 Immersion (301Th)
Based on BTC price of $70,457 and current network difficulty as of Mar 20, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Bitmain Antminer S21 Immersion (301Th) wins on 5 of 6 factors (efficiency, hashrate, home mining score, noise level, price-performance). The Antminer KS3 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 Immersion (301Th)Score: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21 Immersion (301Th)18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer KS3 or Bitmain Antminer S21 Immersion (301Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 Immersion (301Th) is more profitable at $-4.17/day compared to $-8.11/day for the Antminer KS3. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer KS3 or Bitmain Antminer S21 Immersion (301Th)?
The Bitmain Antminer S21 Immersion (301Th) is quieter at 50 dB compared to the Antminer KS3 at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer KS3 or Bitmain Antminer S21 Immersion (301Th)?
The Bitmain Antminer S21 Immersion (301Th) scores 44/100 on our Home Mining Score (vs 36/100 for the Antminer KS3). 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 Antminer KS3 and Bitmain Antminer S21 Immersion (301Th)?
The Antminer KS3 runs at 372.3 J/TH while the Bitmain Antminer S21 Immersion (301Th) runs at 18.5 J/TH — a difference of 353.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.