Antminer KS3 vs Antminer S21 Hydro
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer KS3 | Specification | Antminer S21 Hydro |
|---|---|---|
| 9.4 TH/s | Taux de hachage | 335.0 TH/s |
| 3,500 W | Consommation électrique | 5,360 W |
| 372.3 J/TH | Efficiency | 16.0 J/TH |
| 75 dB | Niveau de bruit | 50 dB |
| 16.1 kg | Weight | 15.8 kg |
| 11,942 BTU/hr | BTU Output | 18,288 BTU/hr |
| 36/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| KHeavyHash | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer KS3
Antminer S21 Hydro
Based on BTC price of $78,171 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Selon notre analyse multifactorielle, le Antminer S21 Hydro l'emporte sur 5 des 6 facteurs (efficacité, hashrate, score de minage domestique, niveau sonore, rapport qualité-prix). Its biggest concrete edge: 3464% more hashrate (9.4 vs 335.0 TH/s). That said, the Antminer KS3 isn't beaten everywhere — it still wins consommation électrique. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
The Antminer KS3 and Antminer S21 Hydro diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Antminer S21 Hydro 3464% more hashrate (9.4 vs 335.0 TH/s)
- Antminer KS3 35% better power draw (3,500 vs 5,360 W)
- Antminer S21 Hydro 96% better efficacité (372.3 vs 16.0 J/TH)
- Antminer S21 Hydro 33% better noise (75.0 vs 50.0 dB)
- Antminer S21 Hydro 2% better weight (16.1 vs 15.8 kg)
- Antminer S21 Hydro 53% more heat output (11,942 vs 18,288 BTU/hr)
- Antminer S21 Hydro 22% more score de minage domestique (36.0 vs 44.0)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| Antminer KS3 | Metric | Antminer S21 Hydro |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | $9,500 |
| -$8.06 | Daily net profit | -$0.81 |
| -$10,943 | Net after 1 year | -$9,797 |
| -$13,885 | Net after 2 years | -$10,094 |
| -$16,828 | Net after 3 years | -$10,390 |
| Does not pay back at current rates (negative daily profit) | Payback period | Does not pay back at current rates (negative daily profit) |
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
TieBoth miners produce similar daily profit.
Best for Home Mining
Antminer S21 HydroScore: 44/100. 50 dB noise level.
Best for Efficiency
Antminer S21 Hydro16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer KS3 vs Antminer S21 Hydro: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 Hydro is more profitable at $-0.81/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 Antminer S21 Hydro?
The Antminer S21 Hydro 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 Antminer S21 Hydro?
The Antminer S21 Hydro 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 Antminer S21 Hydro: how much does the efficiency gap matter?
The Antminer KS3 runs at 372.3 J/TH while the Antminer S21 Hydro runs at 16.0 J/TH — a difference of 356.3 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 96% better efficacité (372.3 vs 16.0 J/TH).