Bitmain Antminer S9 (13Th) vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S9 (13Th) | Specification | Whatsminer M66S |
|---|---|---|
| 13.0 TH/s | Hashrate | 298.0 TH/s |
| 1,300 W | Power Consumption | 5,518 W |
| 100.0 J/TH | Efficiency | 18.5 J/TH |
| — | Noise Level | 50 dB |
| 4,200.0 kg | Weight | 13.5 kg |
| 4,436 BTU/hr | BTU Output | 18,827 BTU/hr |
| 31/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S9 (13Th)
Whatsminer M66S
Based on BTC price of $79,051 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Whatsminer M66S comes out ahead — it takes 4 of 6 (efficiency, hashrate, home mining score, noise level). Where it pulls away hardest is 2192% more hashrate (13.0 vs 298.0 TH/s). That said, the Bitmain Antminer S9 (13Th) isn't beaten everywhere — it still wins power consumption and price-performance. 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 Bitmain Antminer S9 (13Th) and Whatsminer M66S sit on each measurable spec:
- Whatsminer M66S 2192% more hashrate (13.0 vs 298.0 TH/s)
- Bitmain Antminer S9 (13Th) 76% better power draw (1,300 vs 5,518 W)
- Whatsminer M66S 81% better efficiency (100.0 vs 18.5 J/TH)
- Whatsminer M66S 100% better weight (4,200.0 vs 13.5 kg)
- Whatsminer M66S 324% more heat output (4,436 vs 18,827 BTU/hr)
- Whatsminer M66S 42% more home mining score (31.0 vs 44.0)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| Bitmain Antminer S9 (13Th) | Metric | Whatsminer M66S |
|---|---|---|
| $65 | Upfront cost (MSRP) | $8,000 |
| -$2.65 | Daily net profit | -$2.40 |
| -$1,031 | Net after 1 year | -$8,877 |
| -$1,997 | Net after 2 years | -$9,754 |
| -$2,964 | Net after 3 years | -$10,631 |
| 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
Whatsminer M66SScore: 44/100. 50 dB noise level.
Best for Efficiency
Whatsminer M66S18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer S9 (13Th) or Whatsminer M66S more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Whatsminer M66S is more profitable at $-2.40/day compared to $-2.65/day for the Bitmain Antminer S9 (13Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Bitmain Antminer S9 (13Th) or the Whatsminer M66S better for noise-sensitive spaces?
The Whatsminer M66S is quieter at 50 dB compared to the Bitmain Antminer S9 (13Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Bitmain Antminer S9 (13Th) or Whatsminer M66S?
The Whatsminer M66S scores 44/100 on our Home Mining Score (vs 31/100 for the Bitmain Antminer S9 (13Th)). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Bitmain Antminer S9 (13Th) and Whatsminer M66S on J/TH?
The Bitmain Antminer S9 (13Th) runs at 100.0 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 81.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 81% better efficiency (100.0 vs 18.5 J/TH).