Antminer K7 vs Bitmain Antminer S3
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer K7 | Specification | Bitmain Antminer S3 |
|---|---|---|
| 63.5 TH/s | Hashrate | 478.0 GH/s |
| 3,080 W | Power Consumption | 366 W |
| 48.5 J/TH | Efficiency | 765.7 J/TH |
| 75 dB | Noise Level | — |
| 14.0 kg | Weight | 5,200.0 kg |
| 10,509 BTU/hr | BTU Output | 1,249 BTU/hr |
| 36/100 | Home Mining Score | 34/100 |
| — | Release Year | — |
| Eaglesong | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer K7
Bitmain Antminer S3
Based on BTC price of $79,032 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Antminer K7 comes out ahead — it takes 4 of 5 (efficiency, hashrate, home mining score, noise level). Its biggest concrete edge: 13185% more hashrate (63.5 vs 0.5 TH/s). The Bitmain Antminer S3 holds the edge in power consumption. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
Stripped to the numbers, this is how far apart the Antminer K7 and Bitmain Antminer S3 sit on each measurable spec:
- Antminer K7 13185% more hashrate (63.5 vs 0.5 TH/s)
- Bitmain Antminer S3 88% better power draw (3,080 vs 366 W)
- Antminer K7 94% better efficiency (48.5 vs 765.7 J/TH)
- Antminer K7 100% better weight (14.0 vs 5,200.0 kg)
- Antminer K7 742% more heat output (10,509 vs 1,249 BTU/hr)
- Antminer K7 6% more home mining score (36.0 vs 34.0)
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 K7 | Metric | Bitmain Antminer S3 |
|---|---|---|
| $3,500 | Upfront cost (MSRP) | — |
| -$5.08 | Daily net profit | -$0.86 |
| -$5,355 | Net after 1 year | -$314 |
| -$7,210 | Net after 2 years | -$629 |
| -$9,065 | Net after 3 years | -$943 |
| Does not pay back at current rates (negative daily profit) | Payback period | — |
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 K7Score: 36/100. 75 dB noise level.
Best for Efficiency
Antminer K748.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer K7 vs Bitmain Antminer S3: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S3 is more profitable at $-0.86/day compared to $-5.08/day for the Antminer K7. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Antminer K7 vs Bitmain Antminer S3: which runs at a lower noise level?
The Antminer K7 is quieter at 75 dB compared to the Bitmain Antminer S3 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer K7 or Bitmain Antminer S3?
The Antminer K7 scores 36/100 on our Home Mining Score (vs 34/100 for the Bitmain Antminer S3). 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 K7 and Bitmain Antminer S3?
The Antminer K7 runs at 48.5 J/TH while the Bitmain Antminer S3 runs at 765.7 J/TH — a difference of 717.2 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 94% better efficiency (48.5 vs 765.7 J/TH).