Antminer K7 vs Antminer S21+
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer K7 | Specification | Antminer S21+ |
|---|---|---|
| 63.5 TH/s | Hashrate | 216.0 TH/s |
| 3,080 W | Power Consumption | 3,564 W |
| 48.5 J/TH | Efficiency | 16.5 J/TH |
| 75 dB | Noise Level | 75 dB |
| 14.0 kg | Weight | 15.0 kg |
| 10,509 BTU/hr | BTU Output | 12,160 BTU/hr |
| 36/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| Eaglesong | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer K7
Antminer S21+
Based on BTC price of $76,884 and current network difficulty as of May 18, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Antminer S21+, which leads on 3 of 5 weighted factors (efficiency, hashrate, price-performance). Where it pulls away hardest is 240% more hashrate (63.5 vs 216.0 TH/s). That said, the Antminer K7 isn't beaten everywhere — it still wins power consumption and home mining score. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Stripped to the numbers, this is how far apart the Antminer K7 and Antminer S21+ sit on each measurable spec:
- Antminer S21+ 240% more hashrate (63.5 vs 216.0 TH/s)
- Antminer K7 14% better power draw (3,080 vs 3,564 W)
- Antminer S21+ 66% better efficiency (48.5 vs 16.5 J/TH)
- Antminer K7 7% better weight (14.0 vs 15.0 kg)
- Antminer S21+ 16% more heat output (10,509 vs 12,160 BTU/hr)
- Antminer K7 20% more home mining score (36.0 vs 30.0)
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 S21+ |
|---|---|---|
| $3,500 | Upfront cost (MSRP) | $6,500 |
| -$5.15 | Daily net profit | -$0.91 |
| -$5,378 | Net after 1 year | -$6,833 |
| -$7,256 | Net after 2 years | -$7,165 |
| -$9,134 | Net after 3 years | -$7,498 |
| 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
Antminer K7Score: 36/100. 75 dB noise level.
Best for Efficiency
Antminer S21+16.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer K7 or Antminer S21+ more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21+ is more profitable at $-0.91/day compared to $-5.15/day for the Antminer K7. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer K7 or Antminer S21+?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
For mining at home, should I pick the Antminer K7 or the Antminer S21+?
The Antminer K7 scores 36/100 on our Home Mining Score (vs 30/100 for the Antminer S21+). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
Antminer K7 vs Antminer S21+: how much does the efficiency gap matter?
The Antminer K7 runs at 48.5 J/TH while the Antminer S21+ runs at 16.5 J/TH — a difference of 32.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 66% better efficiency (48.5 vs 16.5 J/TH).