Bitmain Antminer S21 Immersion (301Th)
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 | Taux de hachage | 301.0 TH/s |
| 3,500 W | Consommation électrique | 5,569 W |
| 372.3 J/TH | Efficiency | 18.5 J/TH |
| 75 dB | Niveau de bruit | 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 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer KS3
Bitmain Antminer S21 Immersion (301Th)
Based on BTC price of $78,185 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S21 Immersion (301Th) comes out ahead — it takes 5 of 6 (efficacité, hashrate, score de minage domestique, niveau sonore, rapport qualité-prix). Its biggest concrete edge: 3102% more hashrate (9.4 vs 301.0 TH/s). The Antminer KS3 claws back ground on consommation électrique. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
Here is every spec where the Antminer KS3 and Bitmain Antminer S21 Immersion (301Th) actually differ, with the gap quantified:
- Bitmain Antminer S21 Immersion (301Th) 3102% more hashrate (9.4 vs 301.0 TH/s)
- Antminer KS3 37% better power draw (3,500 vs 5,569 W)
- Bitmain Antminer S21 Immersion (301Th) 95% better efficacité (372.3 vs 18.5 J/TH)
- Bitmain Antminer S21 Immersion (301Th) 33% better noise (75.0 vs 50.0 dB)
- Antminer KS3 6% better weight (16.1 vs 17.2 kg)
- Bitmain Antminer S21 Immersion (301Th) 59% more heat output (11,942 vs 19,001 BTU/hr)
- Bitmain Antminer S21 Immersion (301Th) 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 | Bitmain Antminer S21 Immersion (301Th) |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | $3,333 |
| -$8.06 | Daily net profit | -$2.54 |
| -$10,943 | Net after 1 year | -$4,258 |
| -$13,885 | Net after 2 years | -$5,184 |
| -$16,828 | Net after 3 years | -$6,109 |
| 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
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
Antminer KS3 vs Bitmain Antminer S21 Immersion (301Th): which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 Immersion (301Th) is more profitable at $-2.54/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.
Is the Antminer KS3 or the Bitmain Antminer S21 Immersion (301Th) better for noise-sensitive spaces?
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.
For mining at home, should I pick the Antminer KS3 or the 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. In relative terms that is 95% better efficacité (372.3 vs 18.5 J/TH).