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 $79,027 and current network difficulty as of May 15, 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 standout gap is 3709% more hashrate (9.4 vs 358.0 TH/s) in the Bitmain Antminer S21+ Hyd (358Th)'s favour. The Antminer KS3 claws back ground on power consumption. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
The Antminer KS3 and Bitmain Antminer S21+ Hyd (358Th) diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S21+ Hyd (358Th) 3709% more hashrate (9.4 vs 358.0 TH/s)
- Antminer KS3 35% better power draw (3,500 vs 5,370 W)
- Bitmain Antminer S21+ Hyd (358Th) 96% better efficiency (372.3 vs 15.0 J/TH)
- Bitmain Antminer S21+ Hyd (358Th) 33% better noise (75.0 vs 50.0 dB)
- Bitmain Antminer S21+ Hyd (358Th) 20% better weight (16.1 vs 12.8 kg)
- Bitmain Antminer S21+ Hyd (358Th) 53% more heat output (11,942 vs 18,322 BTU/hr)
- Bitmain Antminer S21+ Hyd (358Th) 22% more home mining score (36.0 vs 44.0)
Cost & ROI Over Time
Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.
| Antminer KS3 | Metric | Bitmain Antminer S21+ Hyd (358Th) |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | $2,757 |
| -$8.06 | Daily net profit | $0.13 |
| -$10,941 | Net after 1 year | -$2,709 |
| -$13,882 | Net after 2 years | -$2,661 |
| -$16,824 | Net after 3 years | -$2,613 |
| Does not pay back at current rates (negative daily profit) | Payback period | Takes ~57.5 years to pay back at current rates |
Projections assume continuous operation, a flat $0.10/kWh rate, and no hardware degradation, pool fees, or BTC price change. Real-world ROI varies.
Best For...
Best for Profitability
Bitmain Antminer S21+ Hyd (358Th)$8.19/day higher profit at current rates.
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
Which makes more money, the Antminer KS3 or the Bitmain Antminer S21+ Hyd (358Th)?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21+ Hyd (358Th) is more profitable at $0.13/day compared to $-8.06/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.
Antminer KS3 vs Bitmain Antminer S21+ Hyd (358Th): which fits a residential setup better?
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.
Antminer KS3 vs Bitmain Antminer S21+ Hyd (358Th): how much does the efficiency gap matter?
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. In relative terms that is 96% better efficiency (372.3 vs 15.0 J/TH).