Antminer S21 vs Bitmain Antminer S9i (14Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 | Specification | Bitmain Antminer S9i (14Th) |
|---|---|---|
| 200.0 TH/s | Taux de hachage | 14.0 TH/s |
| 3,500 W | Consommation électrique | 1,320 W |
| 17.5 J/TH | Efficiency | 94.3 J/TH |
| 75 dB | Niveau de bruit | — |
| 14.6 kg | Weight | 4.2 kg |
| 11,942 BTU/hr | BTU Output | 4,504 BTU/hr |
| 36/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21
Bitmain Antminer S9i (14Th)
Based on BTC price of $62,980 and current network difficulty as of Jun 4, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Antminer S21, which leads on 4 of 6 weighted factors (efficacité, hashrate, score de minage domestique, niveau sonore). Its biggest concrete edge: 1329% more hashrate (200.0 vs 14.0 TH/s). The Bitmain Antminer S9i (14Th) holds the edge in consommation électrique and rapport qualité-prix. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Here is every spec where the Antminer S21 and Bitmain Antminer S9i (14Th) actually differ, with the gap quantified:
- Antminer S21 1329% more hashrate (200.0 vs 14.0 TH/s)
- Bitmain Antminer S9i (14Th) 62% better power draw (3,500 vs 1,320 W)
- Antminer S21 81% better efficacité (17.5 vs 94.3 J/TH)
- Bitmain Antminer S9i (14Th) 71% better weight (14.6 vs 4.2 kg)
- Antminer S21 165% more heat output (11,942 vs 4,504 BTU/hr)
- Antminer S21 16% more score de minage domestique (36.0 vs 31.0)
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.
| Antminer S21 | Metric | Bitmain Antminer S9i (14Th) |
|---|---|---|
| $5,500 | Upfront cost (MSRP) | $65 |
| -$2.70 | Daily net profit | -$2.77 |
| -$6,486 | Net after 1 year | -$1,076 |
| -$7,472 | Net after 2 years | -$2,086 |
| -$8,458 | Net after 3 years | -$3,097 |
| 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
Antminer S21Score: 36/100. 75 dB noise level.
Best for Efficiency
Antminer S2117.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 or Bitmain Antminer S9i (14Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 is more profitable at $-2.70/day compared to $-2.77/day for the Bitmain Antminer S9i (14Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Antminer S21 or the Bitmain Antminer S9i (14Th) better for noise-sensitive spaces?
The Antminer S21 is quieter at 75 dB compared to the Bitmain Antminer S9i (14Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Antminer S21 or the Bitmain Antminer S9i (14Th)?
The Antminer S21 scores 36/100 on our Home Mining Score (vs 31/100 for the Bitmain Antminer S9i (14Th)). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
Antminer S21 vs Bitmain Antminer S9i (14Th): how much does the efficiency gap matter?
The Antminer S21 runs at 17.5 J/TH while the Bitmain Antminer S9i (14Th) runs at 94.3 J/TH — a difference of 76.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 81% better efficacité (17.5 vs 94.3 J/TH).