Antminer KS3 vs Bitmain Antminer S21 XP Immersion
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer KS3 | Specification | Bitmain Antminer S21 XP Immersion |
|---|---|---|
| 9.4 TH/s | Hashrate | 300.0 TH/s |
| 3,500 W | Power Consumption | 4,050 W |
| 372.3 J/TH | Efficiency | 13.5 J/TH |
| 75 dB | Noise Level | 50 dB |
| 16.1 kg | Weight | 14.4 kg |
| 11,942 BTU/hr | BTU Output | 13,819 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 XP Immersion
Based on BTC price of $79,065 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Bitmain Antminer S21 XP Immersion, which leads on 5 of 6 weighted factors (efficiency, hashrate, home mining score, noise level, price-performance). Where it pulls away hardest is 3091% more hashrate (9.4 vs 300.0 TH/s). 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 XP Immersion diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S21 XP Immersion 3091% more hashrate (9.4 vs 300.0 TH/s)
- Antminer KS3 14% better power draw (3,500 vs 4,050 W)
- Bitmain Antminer S21 XP Immersion 96% better efficiency (372.3 vs 13.5 J/TH)
- Bitmain Antminer S21 XP Immersion 33% better noise (75.0 vs 50.0 dB)
- Bitmain Antminer S21 XP Immersion 11% better weight (16.1 vs 14.4 kg)
- Bitmain Antminer S21 XP Immersion 16% more heat output (11,942 vs 13,819 BTU/hr)
- Bitmain Antminer S21 XP Immersion 22% more home mining score (36.0 vs 44.0)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Antminer KS3 | Metric | Bitmain Antminer S21 XP Immersion |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | $1,593 |
| -$8.06 | Daily net profit | $1.20 |
| -$10,941 | Net after 1 year | -$1,157 |
| -$13,882 | Net after 2 years | -$720 |
| -$16,823 | Net after 3 years | -$284 |
| Does not pay back at current rates (negative daily profit) | Payback period | Takes ~3.7 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 XP Immersion$9.25/day higher profit at current rates.
Best for Home Mining
Bitmain Antminer S21 XP ImmersionScore: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21 XP Immersion13.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer KS3 or Bitmain Antminer S21 XP Immersion more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 XP Immersion is more profitable at $1.20/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.
Antminer KS3 vs Bitmain Antminer S21 XP Immersion: which runs at a lower noise level?
The Bitmain Antminer S21 XP Immersion 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 XP Immersion: which fits a residential setup better?
The Bitmain Antminer S21 XP Immersion 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 XP Immersion: how much does the efficiency gap matter?
The Antminer KS3 runs at 372.3 J/TH while the Bitmain Antminer S21 XP Immersion runs at 13.5 J/TH — a difference of 358.8 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 13.5 J/TH).