Antminer KS3 vs Bitmain Antminer S21+ Hyd (358Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer KS3 | Specification | Bitmain Antminer S21+ Hyd (358Th) |
|---|---|---|
| 9.4 TH/s | Hashrate | 358.0 TH/s |
| 3,500 W | Power Consumption | 5,370 W |
| 372.3 J/TH | Efficiency | 15.0 J/TH |
| 75 dB | Noise Level | 50 dB |
| 16.1 kg | Weight | 12.8 kg |
| 11,942 BTU/hr | BTU Output | 18,322 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+ Hyd (358Th)
Based on BTC price of $74,349 and current network difficulty as of Mar 16, 2026. Actual results vary.
Verdict
Based on specs, the Bitmain Antminer S21+ Hyd (358Th) offers 96% better efficiency at 15.0 J/TH compared to the Antminer KS3 at 372.3 J/TH. This directly impacts daily operating costs and long-term profitability.
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 Antminer KS3 or Bitmain Antminer S21+ Hyd (358Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21+ Hyd (358Th) is more profitable at $-1.35/day compared to $-8.10/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+ Hyd (358Th)?
The Bitmain Antminer S21+ Hyd (358Th) 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+ Hyd (358Th)?
The Bitmain Antminer S21+ Hyd (358Th) 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+ Hyd (358Th)?
The Antminer KS3 runs at 372.3 J/TH while the Bitmain Antminer S21+ Hyd (358Th) runs at 15.0 J/TH — a difference of 357.3 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.