Antminer K7 vs Bitmain Antminer S21 Immersion (301Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer K7 | Specification | Bitmain Antminer S21 Immersion (301Th) |
|---|---|---|
| 63.5 TH/s | Hashrate | 301.0 TH/s |
| 3,080 W | Power Consumption | 5,569 W |
| 48.5 J/TH | Efficiency | 18.5 J/TH |
| 75 dB | Noise Level | 50 dB |
| 14.0 kg | Weight | 17.2 kg |
| 10,509 BTU/hr | BTU Output | 19,001 BTU/hr |
| 36/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| Eaglesong | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer K7
Bitmain Antminer S21 Immersion (301Th)
Based on BTC price of $79,033 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Bitmain Antminer S21 Immersion (301Th), which leads on 5 of 6 weighted factors (efficiency, hashrate, home mining score, noise level, price-performance). Where it pulls away hardest is 374% more hashrate (63.5 vs 301.0 TH/s). That said, the Antminer K7 isn't beaten everywhere — it still wins power consumption. 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 K7 and Bitmain Antminer S21 Immersion (301Th) actually differ, with the gap quantified:
- Bitmain Antminer S21 Immersion (301Th) 374% more hashrate (63.5 vs 301.0 TH/s)
- Antminer K7 45% better power draw (3,080 vs 5,569 W)
- Bitmain Antminer S21 Immersion (301Th) 62% better efficiency (48.5 vs 18.5 J/TH)
- Bitmain Antminer S21 Immersion (301Th) 33% better noise (75.0 vs 50.0 dB)
- Antminer K7 18% better weight (14.0 vs 17.2 kg)
- Bitmain Antminer S21 Immersion (301Th) 81% more heat output (10,509 vs 19,001 BTU/hr)
- Bitmain Antminer S21 Immersion (301Th) 22% more home mining score (36.0 vs 44.0)
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 | Bitmain Antminer S21 Immersion (301Th) |
|---|---|---|
| $3,500 | Upfront cost (MSRP) | $3,333 |
| -$5.08 | Daily net profit | -$2.42 |
| -$5,355 | Net after 1 year | -$4,215 |
| -$7,210 | Net after 2 years | -$5,098 |
| -$9,065 | Net after 3 years | -$5,981 |
| 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 S21 Immersion (301Th)Score: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21 Immersion (301Th)18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Antminer K7 or the Bitmain Antminer S21 Immersion (301Th)?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 Immersion (301Th) is more profitable at $-2.42/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.
Is the Antminer K7 or the Bitmain Antminer S21 Immersion (301Th) better for noise-sensitive spaces?
The Bitmain Antminer S21 Immersion (301Th) is quieter at 50 dB compared to the Antminer K7 at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Antminer K7 vs Bitmain Antminer S21 Immersion (301Th): which fits a residential setup better?
The Bitmain Antminer S21 Immersion (301Th) scores 44/100 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.
Antminer K7 vs Bitmain Antminer S21 Immersion (301Th): how much does the efficiency gap matter?
The Antminer K7 runs at 48.5 J/TH while the Bitmain Antminer S21 Immersion (301Th) runs at 18.5 J/TH — a difference of 30.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 62% better efficiency (48.5 vs 18.5 J/TH).