Antminer K7 vs Bitmain Antminer S21 Hyd (335Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer K7 | Specification | Bitmain Antminer S21 Hyd (335Th) |
|---|---|---|
| 63.5 TH/s | Hashrate | 335.0 TH/s |
| 3,080 W | Power Consumption | 5,360 W |
| 48.5 J/TH | Efficiency | 16.0 J/TH |
| 75 dB | Noise Level | — |
| 14.0 kg | Weight | 14.2 kg |
| 10,509 BTU/hr | BTU Output | 18,288 BTU/hr |
| 36/100 | Home Mining Score | 16/100 |
| — | Release Year | — |
| Eaglesong | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer K7
Bitmain Antminer S21 Hyd (335Th)
Based on BTC price of $79,027 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Bitmain Antminer S21 Hyd (335Th) wins on 3 of 6 factors (efficiency, hashrate, price-performance). Its biggest concrete edge: 428% more hashrate (63.5 vs 335.0 TH/s). The Antminer K7 holds the edge in power consumption and home mining score and noise level. 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 S21 Hyd (335Th) sit on each measurable spec:
- Bitmain Antminer S21 Hyd (335Th) 428% more hashrate (63.5 vs 335.0 TH/s)
- Antminer K7 43% better power draw (3,080 vs 5,360 W)
- Bitmain Antminer S21 Hyd (335Th) 67% better efficiency (48.5 vs 16.0 J/TH)
- Antminer K7 1% better weight (14.0 vs 14.2 kg)
- Bitmain Antminer S21 Hyd (335Th) 74% more heat output (10,509 vs 18,288 BTU/hr)
- Antminer K7 125% more home mining score (36.0 vs 16.0)
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 Hyd (335Th) |
|---|---|---|
| $3,500 | Upfront cost (MSRP) | $3,999 |
| -$5.08 | Daily net profit | -$0.68 |
| -$5,355 | Net after 1 year | -$4,248 |
| -$7,210 | Net after 2 years | -$4,496 |
| -$9,066 | Net after 3 years | -$4,745 |
| 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
Bitmain Antminer S21 Hyd (335Th)16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer K7 vs Bitmain Antminer S21 Hyd (335Th): which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 Hyd (335Th) is more profitable at $-0.68/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.
Which is quieter, the Antminer K7 or Bitmain Antminer S21 Hyd (335Th)?
The Antminer K7 is quieter at 75 dB compared to the Bitmain Antminer S21 Hyd (335Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Antminer K7 or the Bitmain Antminer S21 Hyd (335Th)?
The Antminer K7 scores 36/100 on our Home Mining Score (vs 16/100 for the Bitmain Antminer S21 Hyd (335Th)). 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 S21 Hyd (335Th)?
The Antminer K7 runs at 48.5 J/TH while the Bitmain Antminer S21 Hyd (335Th) runs at 16.0 J/TH — a difference of 32.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 67% better efficiency (48.5 vs 16.0 J/TH).