Antminer K7 vs Antminer S9i
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer K7 | Specification | Antminer S9i |
|---|---|---|
| 63.5 TH/s | Hashrate | 14.0 TH/s |
| 3,080 W | Power Consumption | 1,320 W |
| 48.5 J/TH | Efficiency | 94.3 J/TH |
| 75 dB | Noise Level | 76 dB |
| 14.0 kg | Weight | 4.2 kg |
| 10,509 BTU/hr | BTU Output | 4,504 BTU/hr |
| 36/100 | Home Mining Score | 83/100 |
| — | Release Year | — |
| Eaglesong | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer K7
Antminer S9i
Based on BTC price of $77,884 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Antminer K7 comes out ahead — it takes 3 of 5 (efficiency, hashrate, noise level). The standout gap is 354% more hashrate (63.5 vs 14.0 TH/s) in the Antminer K7's favour. The Antminer S9i holds the edge in power consumption and home mining score. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
The Antminer K7 and Antminer S9i diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Antminer K7 354% more hashrate (63.5 vs 14.0 TH/s)
- Antminer S9i 57% better power draw (3,080 vs 1,320 W)
- Antminer K7 49% better efficiency (48.5 vs 94.3 J/TH)
- Antminer K7 1% better noise (75.0 vs 76.0 dB)
- Antminer S9i 70% better weight (14.0 vs 4.2 kg)
- Antminer K7 133% more heat output (10,509 vs 4,504 BTU/hr)
- Antminer S9i 131% more home mining score (36.0 vs 83.0)
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 K7 | Metric | Antminer S9i |
|---|---|---|
| $3,500 | Upfront cost (MSRP) | — |
| -$5.12 | Daily net profit | -$2.67 |
| -$5,367 | Net after 1 year | -$973 |
| -$7,235 | Net after 2 years | -$1,946 |
| -$9,102 | Net after 3 years | -$2,920 |
| 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 S9iScore: 83/100. 76 dB noise level.
Best for Efficiency
Antminer K748.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Antminer K7 or the Antminer S9i?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S9i is more profitable at $-2.67/day compared to $-5.12/day for the Antminer K7. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Antminer K7 or the Antminer S9i better for noise-sensitive spaces?
The Antminer K7 is quieter at 75 dB compared to the Antminer S9i at 76 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer K7 or Antminer S9i?
The Antminer S9i scores 83/100 on our Home Mining Score (vs 36/100 for the Antminer K7). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Antminer K7 and Antminer S9i on J/TH?
The Antminer K7 runs at 48.5 J/TH while the Antminer S9i runs at 94.3 J/TH — a difference of 45.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 49% better efficiency (48.5 vs 94.3 J/TH).