Antminer S9i vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S9i | Specification | Whatsminer M66S |
|---|---|---|
| 14.0 TH/s | Taux de hachage | 298.0 TH/s |
| 1,320 W | Consommation électrique | 5,518 W |
| 94.3 J/TH | Efficiency | 18.5 J/TH |
| 76 dB | Niveau de bruit | 50 dB |
| 4.2 kg | Weight | 13.5 kg |
| 4,504 BTU/hr | BTU Output | 18,827 BTU/hr |
| 83/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Antminer S9i
Whatsminer M66S
Based on BTC price of $78,244 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Whatsminer M66S, which leads on 3 of 5 weighted factors (efficacité, hashrate, niveau sonore). Its biggest concrete edge: 2029% more hashrate (14.0 vs 298.0 TH/s). The Antminer S9i holds the edge in consommation électrique and score de minage domestique. 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 S9i and Whatsminer M66S sit on each measurable spec:
- Whatsminer M66S 2029% more hashrate (14.0 vs 298.0 TH/s)
- Antminer S9i 76% better power draw (1,320 vs 5,518 W)
- Whatsminer M66S 80% better efficacité (94.3 vs 18.5 J/TH)
- Whatsminer M66S 34% better noise (76.0 vs 50.0 dB)
- Antminer S9i 69% better weight (4.2 vs 13.5 kg)
- Whatsminer M66S 318% more heat output (4,504 vs 18,827 BTU/hr)
- Antminer S9i 89% more score de minage domestique (83.0 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 S9i | Metric | Whatsminer M66S |
|---|---|---|
| — | Upfront cost (MSRP) | $8,000 |
| -$2.66 | Daily net profit | -$2.51 |
| -$972 | Net after 1 year | -$8,917 |
| -$1,945 | Net after 2 years | -$9,835 |
| -$2,917 | Net after 3 years | -$10,752 |
| — | 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 S9iScore: 83/100. 76 dB noise level.
Best for Efficiency
Whatsminer M66S18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S9i or Whatsminer M66S more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Whatsminer M66S is more profitable at $-2.51/day compared to $-2.66/day for the Antminer S9i. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Antminer S9i vs Whatsminer M66S: which runs at a lower noise level?
The Whatsminer M66S is quieter at 50 dB compared to the Antminer S9i at 76 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Antminer S9i or the Whatsminer M66S?
The Antminer S9i scores 83/100 on our Home Mining Score (vs 44/100 for the Whatsminer M66S). 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 S9i and Whatsminer M66S?
The Antminer S9i runs at 94.3 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 75.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 80% better efficacité (94.3 vs 18.5 J/TH).