Bitmain Antminer S9 (11.5Th) vs Canaan AvalonMiner 821
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S9 (11.5Th) | Specification | Canaan AvalonMiner 821 |
|---|---|---|
| 11.5 TH/s | Hashrate | 11.5 TH/s |
| 1,127 W | Power Consumption | 1,200 W |
| 98.0 J/TH | Efficiency | 104.4 J/TH |
| — | Noise Level | — |
| 4,200.0 kg | Weight | 4,700.0 kg |
| 3,845 BTU/hr | BTU Output | 4,094 BTU/hr |
| 31/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Canaan |
Profitability Comparison
Bitmain Antminer S9 (11.5Th)
Canaan AvalonMiner 821
Based on BTC price of $77,866 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S9 (11.5Th) comes out ahead — it takes 3 of 3 (efficiency, power consumption, price-performance). Where it pulls away hardest is 6% better efficiency (98.0 vs 104.4 J/TH). The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
The Bitmain Antminer S9 (11.5Th) and Canaan AvalonMiner 821 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S9 (11.5Th) 6% better power draw (1,127 vs 1,200 W)
- Bitmain Antminer S9 (11.5Th) 6% better efficiency (98.0 vs 104.4 J/TH)
- Bitmain Antminer S9 (11.5Th) 11% better weight (4,200 vs 4,700 kg)
- Canaan AvalonMiner 821 6% more heat output (3,845 vs 4,094 BTU/hr)
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.
| Bitmain Antminer S9 (11.5Th) | Metric | Canaan AvalonMiner 821 |
|---|---|---|
| $65 | Upfront cost (MSRP) | $699 |
| -$2.29 | Daily net profit | -$2.47 |
| -$902 | Net after 1 year | -$1,600 |
| -$1,739 | Net after 2 years | -$2,501 |
| -$2,576 | Net after 3 years | -$3,401 |
| 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
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer S9 (11.5Th)98.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S9 (11.5Th) vs Canaan AvalonMiner 821: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S9 (11.5Th) is more profitable at $-2.29/day compared to $-2.47/day for the Canaan AvalonMiner 821. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer S9 (11.5Th) vs Canaan AvalonMiner 821: which runs at a lower noise level?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
For mining at home, should I pick the Bitmain Antminer S9 (11.5Th) or the Canaan AvalonMiner 821?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
Bitmain Antminer S9 (11.5Th) vs Canaan AvalonMiner 821: how much does the efficiency gap matter?
The Bitmain Antminer S9 (11.5Th) runs at 98.0 J/TH while the Canaan AvalonMiner 821 runs at 104.4 J/TH — a difference of 6.3 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 6% better efficiency (98.0 vs 104.4 J/TH).