Antminer K7 vs Antminer S21 Hydro
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer K7 | Specification | Antminer S21 Hydro |
|---|---|---|
| 63.5 TH/s | Taux de hachage | 335.0 TH/s |
| 3,080 W | Consommation électrique | 5,360 W |
| 48.5 J/TH | Efficiency | 16.0 J/TH |
| 75 dB | Niveau de bruit | 50 dB |
| 14.0 kg | Weight | 15.8 kg |
| 10,509 BTU/hr | BTU Output | 18,288 BTU/hr |
| 36/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| Eaglesong | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer K7
Antminer S21 Hydro
Based on BTC price of $78,179 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Antminer S21 Hydro comes out ahead — it takes 5 of 6 (efficacité, hashrate, score de minage domestique, niveau sonore, rapport qualité-prix). The standout gap is 428% more hashrate (63.5 vs 335.0 TH/s) in the Antminer S21 Hydro's favour. That said, the Antminer K7 isn't beaten everywhere — it still wins consommation électrique. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Stripped to the numbers, this is how far apart the Antminer K7 and Antminer S21 Hydro sit on each measurable spec:
- Antminer S21 Hydro 428% more hashrate (63.5 vs 335.0 TH/s)
- Antminer K7 43% better power draw (3,080 vs 5,360 W)
- Antminer S21 Hydro 67% better efficacité (48.5 vs 16.0 J/TH)
- Antminer S21 Hydro 33% better noise (75.0 vs 50.0 dB)
- Antminer K7 11% better weight (14.0 vs 15.8 kg)
- Antminer S21 Hydro 74% more heat output (10,509 vs 18,288 BTU/hr)
- Antminer S21 Hydro 22% more score de minage domestique (36.0 vs 44.0)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Antminer K7 | Metric | Antminer S21 Hydro |
|---|---|---|
| $3,500 | Upfront cost (MSRP) | $9,500 |
| -$5.11 | Daily net profit | -$0.81 |
| -$5,364 | Net after 1 year | -$9,796 |
| -$7,228 | Net after 2 years | -$10,093 |
| -$9,093 | Net after 3 years | -$10,389 |
| 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 S21 HydroScore: 44/100. 50 dB noise level.
Best for Efficiency
Antminer S21 Hydro16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer K7 or Antminer S21 Hydro more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 Hydro is more profitable at $-0.81/day compared to $-5.11/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 Antminer S21 Hydro: which runs at a lower noise level?
The Antminer S21 Hydro 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.
For mining at home, should I pick the Antminer K7 or the Antminer S21 Hydro?
The Antminer S21 Hydro 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 Antminer S21 Hydro: how much does the efficiency gap matter?
The Antminer K7 runs at 48.5 J/TH while the Antminer S21 Hydro 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 efficacité (48.5 vs 16.0 J/TH).