Antminer KS3 vs Bitmain Antminer S9 (12.5Th)
Side-by-side specs, profitability, and home mining comparison.
Quick verdict
For most buyers the Bitmain Antminer S9 (12.5Th) is the stronger pick — it leads on 5 of 6 head-to-head factors. The Antminer KS3 runs 9.4 TH/s; the Bitmain Antminer S9 (12.5Th) runs 12.5 TH/s.
Specs verified against the D-Central Mining Bible \xc2\xb7 June 2026
Specifications Comparison
| Antminer KS3 | Specification | Bitmain Antminer S9 (12.5Th) |
|---|---|---|
| 9.4 TH/s | Taux de hachage | 12.5 TH/s |
| 3,500 W | Consommation électrique | 1,225 W |
| 372.3 J/TH | Efficiency | 98.0 J/TH |
| 75 dB | Niveau de bruit | — |
| 16.1 kg | Weight | 4.2 kg |
| 11,942 BTU/hr | BTU Output | 4,180 BTU/hr |
| 8/100 | Home Mining Score | 22/100 |
| — | Release Year | — |
| KHeavyHash | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer KS3
Bitmain Antminer S9 (12.5Th)
Based on BTC price of $61,656 and current network difficulty as of Jun 25, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S9 (12.5Th) comes out ahead — it takes 5 of 6 (efficacité, hashrate, consommation électrique, score de minage domestique, rapport qualité-prix). Where it pulls away hardest is 74% better efficacité (372.3 vs 98.0 J/TH). That said, the Antminer KS3 isn't beaten everywhere — it still wins niveau sonore. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Here is every spec where the Antminer KS3 and Bitmain Antminer S9 (12.5Th) actually differ, with the gap quantified:
- Bitmain Antminer S9 (12.5Th) 33% more hashrate (9.4 vs 12.5 TH/s)
- Bitmain Antminer S9 (12.5Th) 65% better power draw (3,500 vs 1,225 W)
- Bitmain Antminer S9 (12.5Th) 74% better efficacité (372.3 vs 98.0 J/TH)
- Bitmain Antminer S9 (12.5Th) 74% better weight (16.1 vs 4.2 kg)
- Antminer KS3 186% more heat output (11,942 vs 4,180 BTU/hr)
- Bitmain Antminer S9 (12.5Th) 175% more score de minage domestique (8.0 vs 22.0)
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 S9 (12.5Th) |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | $65 |
| -$8.11 | Daily net profit | -$2.55 |
| -$10,960 | Net after 1 year | -$997 |
| -$13,919 | Net after 2 years | -$1,928 |
| -$16,879 | Net after 3 years | -$2,860 |
| 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 S9 (12.5Th)Score: 22/100. 0 dB noise level.
Best for Efficiency
Bitmain Antminer S9 (12.5Th)98.0 J/TH — lower electricity cost per terahash.
Foire aux questions
Antminer KS3 vs Bitmain Antminer S9 (12.5Th): which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S9 (12.5Th) is more profitable at $-2.55/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.
Is the Antminer KS3 or the Bitmain Antminer S9 (12.5Th) better for noise-sensitive spaces?
The Antminer KS3 is quieter at 75 dB compared to the Bitmain Antminer S9 (12.5Th) at 0 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 S9 (12.5Th)?
The Bitmain Antminer S9 (12.5Th) scores 22/100 on our Home Mining Score (vs 8/100 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 S9 (12.5Th)?
The Antminer KS3 runs at 372.3 J/TH while the Bitmain Antminer S9 (12.5Th) runs at 98.0 J/TH — a difference of 274.3 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 74% better efficacité (372.3 vs 98.0 J/TH).