Antminer S9j vs MicroBT Whatsminer M66
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S9j | Specification | MicroBT Whatsminer M66 |
|---|---|---|
| 14.5 TH/s | Taux de hachage | 238.0 TH/s |
| 1,350 W | Consommation électrique | 4,736 W |
| 93.1 J/TH | Efficiency | 19.9 J/TH |
| 76 dB | Niveau de bruit | — |
| 4.2 kg | Weight | 16.0 kg |
| 4,606 BTU/hr | BTU Output | 16,159 BTU/hr |
| 83/100 | Home Mining Score | 16/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Antminer S9j
MicroBT Whatsminer M66
Based on BTC price of $78,171 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Weighing six performance factors, the MicroBT Whatsminer M66 comes out ahead — it takes 2 of 5 (efficacité, hashrate). Its biggest concrete edge: 1541% more hashrate (14.5 vs 238.0 TH/s). The Antminer S9j holds the edge in consommation électrique and score de minage domestique and niveau sonore. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
The Antminer S9j and MicroBT Whatsminer M66 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- MicroBT Whatsminer M66 1541% more hashrate (14.5 vs 238.0 TH/s)
- Antminer S9j 71% better power draw (1,350 vs 4,736 W)
- MicroBT Whatsminer M66 79% better efficacité (93.1 vs 19.9 J/TH)
- Antminer S9j 74% better weight (4.2 vs 16.0 kg)
- MicroBT Whatsminer M66 251% more heat output (4,606 vs 16,159 BTU/hr)
- Antminer S9j 419% more score de minage domestique (83.0 vs 16.0)
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 S9j | Metric | MicroBT Whatsminer M66 |
|---|---|---|
| — | Upfront cost (MSRP) | $3,672 |
| -$2.72 | Daily net profit | -$2.80 |
| -$992 | Net after 1 year | -$4,696 |
| -$1,984 | Net after 2 years | -$5,720 |
| -$2,977 | Net after 3 years | -$6,743 |
| — | 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 S9jScore: 83/100. 76 dB noise level.
Best for Efficiency
MicroBT Whatsminer M6619.9 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S9j or MicroBT Whatsminer M66 more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S9j is more profitable at $-2.72/day compared to $-2.80/day for the MicroBT Whatsminer M66. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Antminer S9j vs MicroBT Whatsminer M66: which runs at a lower noise level?
The Antminer S9j is quieter at 76 dB compared to the MicroBT Whatsminer M66 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Antminer S9j vs MicroBT Whatsminer M66: which fits a residential setup better?
The Antminer S9j scores 83/100 on our Home Mining Score (vs 16/100 for the MicroBT Whatsminer M66). 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 S9j and MicroBT Whatsminer M66?
The Antminer S9j runs at 93.1 J/TH while the MicroBT Whatsminer M66 runs at 19.9 J/TH — a difference of 73.2 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 79% better efficacité (93.1 vs 19.9 J/TH).