Antminer KS3 vs Bitmain Antminer KS5 Pro (21Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer KS3 | Specification | Bitmain Antminer KS5 Pro (21Th) |
|---|---|---|
| 9.4 TH/s | Hashrate | 21.0 TH/s |
| 3,500 W | Power Consumption | 3,150 W |
| 372.3 J/TH | Efficiency | 150.0 J/TH |
| 75 dB | Noise Level | 75 dB |
| 16.1 kg | Weight | 15.8 kg |
| 11,942 BTU/hr | BTU Output | 10,748 BTU/hr |
| 36/100 | Home Mining Score | 36/100 |
| — | Release Year | — |
| KHeavyHash | Algorithm | KHeavyHash |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer KS3
Bitmain Antminer KS5 Pro (21Th)
Based on BTC price of $78,208 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer KS5 Pro (21Th) comes out ahead — it takes 4 of 4 (efficiency, hashrate, power consumption, price-performance). Its biggest concrete edge: 60% better efficiency (372 vs 150 J/TH). 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 KS5 Pro (21Th) actually differ, with the gap quantified:
- Bitmain Antminer KS5 Pro (21Th) 123% more hashrate (9.4 vs 21.0 TH/s)
- Bitmain Antminer KS5 Pro (21Th) 10% better power draw (3,500 vs 3,150 W)
- Bitmain Antminer KS5 Pro (21Th) 60% better efficiency (372 vs 150 J/TH)
- Bitmain Antminer KS5 Pro (21Th) 2% better weight (16.1 vs 15.8 kg)
- Antminer KS3 11% more heat output (11,942 vs 10,748 BTU/hr)
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 KS5 Pro (21Th) |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | $860 |
| -$8.06 | Daily net profit | -$6.80 |
| -$10,943 | Net after 1 year | -$3,344 |
| -$13,885 | Net after 2 years | -$5,827 |
| -$16,828 | Net after 3 years | -$8,311 |
| 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
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer KS5 Pro (21Th)150.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer KS3 or Bitmain Antminer KS5 Pro (21Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer KS5 Pro (21Th) is more profitable at $-6.80/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 KS5 Pro (21Th): which runs at a lower noise level?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
For mining at home, should I pick the Antminer KS3 or the Bitmain Antminer KS5 Pro (21Th)?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
What is the efficiency difference between Antminer KS3 and Bitmain Antminer KS5 Pro (21Th)?
The Antminer KS3 runs at 372.3 J/TH while the Bitmain Antminer KS5 Pro (21Th) runs at 150.0 J/TH — a difference of 222.3 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 60% better efficiency (372 vs 150 J/TH).