Bitmain Antminer S9i (14Th) vs Canaan AvalonMiner 821
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S9i (14Th) | Specification | Canaan AvalonMiner 821 |
|---|---|---|
| 14.0 TH/s | Hashrate | 11.5 TH/s |
| 1,320 W | Power Consumption | 1,200 W |
| 94.3 J/TH | Efficiency | 104.4 J/TH |
| — | Noise Level | — |
| 4,200.0 kg | Weight | 4,700.0 kg |
| 4,504 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 S9i (14Th)
Canaan AvalonMiner 821
Based on BTC price of $79,066 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S9i (14Th) comes out ahead — it takes 3 of 4 (efficiency, hashrate, price-performance). Where it pulls away hardest is 22% more hashrate (14.0 vs 11.5 TH/s). The Canaan AvalonMiner 821 claws back ground on power consumption. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Stripped to the numbers, this is how far apart the Bitmain Antminer S9i (14Th) and Canaan AvalonMiner 821 sit on each measurable spec:
- Bitmain Antminer S9i (14Th) 22% more hashrate (14.0 vs 11.5 TH/s)
- Canaan AvalonMiner 821 9% better power draw (1,320 vs 1,200 W)
- Bitmain Antminer S9i (14Th) 10% better efficiency (94.3 vs 104.4 J/TH)
- Bitmain Antminer S9i (14Th) 11% better weight (4,200 vs 4,700 kg)
- Bitmain Antminer S9i (14Th) 10% more heat output (4,504 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 S9i (14Th) | Metric | Canaan AvalonMiner 821 |
|---|---|---|
| $65 | Upfront cost (MSRP) | $699 |
| -$2.66 | Daily net profit | -$2.46 |
| -$1,035 | Net after 1 year | -$1,597 |
| -$2,006 | Net after 2 years | -$2,496 |
| -$2,976 | Net after 3 years | -$3,394 |
| 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 S9i (14Th)94.3 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S9i (14Th) vs Canaan AvalonMiner 821: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Canaan AvalonMiner 821 is more profitable at $-2.46/day compared to $-2.66/day for the Bitmain Antminer S9i (14Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S9i (14Th) or Canaan AvalonMiner 821?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the Bitmain Antminer S9i (14Th) or Canaan AvalonMiner 821?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
How far apart are the Bitmain Antminer S9i (14Th) and Canaan AvalonMiner 821 on J/TH?
The Bitmain Antminer S9i (14Th) runs at 94.3 J/TH while the Canaan AvalonMiner 821 runs at 104.4 J/TH — a difference of 10.1 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 10% better efficiency (94.3 vs 104.4 J/TH).