Antminer S21+ vs Bitmain Antminer S9j (14.5Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21+ | Specification | Bitmain Antminer S9j (14.5Th) |
|---|---|---|
| 216.0 TH/s | Taux de hachage | 14.5 TH/s |
| 3,564 W | Consommation électrique | 1,350 W |
| 16.5 J/TH | Efficiency | 93.1 J/TH |
| 75 dB | Niveau de bruit | — |
| 15.0 kg | Weight | 4,200.0 kg |
| 12,160 BTU/hr | BTU Output | 4,606 BTU/hr |
| 30/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21+
Bitmain Antminer S9j (14.5Th)
Based on BTC price of $78,179 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Antminer S21+, which leads on 3 of 6 weighted factors (efficacité, hashrate, niveau sonore). Where it pulls away hardest is 1390% more hashrate (216.0 vs 14.5 TH/s). That said, the Bitmain Antminer S9j (14.5Th) isn't beaten everywhere — it still wins consommation électrique and score de minage domestique and rapport qualité-prix. 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 Antminer S21+ and Bitmain Antminer S9j (14.5Th) sit on each measurable spec:
- Antminer S21+ 1390% more hashrate (216.0 vs 14.5 TH/s)
- Bitmain Antminer S9j (14.5Th) 62% better power draw (3,564 vs 1,350 W)
- Antminer S21+ 82% better efficacité (16.5 vs 93.1 J/TH)
- Antminer S21+ 100% better weight (15.0 vs 4,200.0 kg)
- Antminer S21+ 164% more heat output (12,160 vs 4,606 BTU/hr)
- Bitmain Antminer S9j (14.5Th) 3% more score de minage domestique (30.0 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 S9j (14.5Th) |
|---|---|---|
| $6,500 | Upfront cost (MSRP) | $65 |
| -$0.78 | Daily net profit | -$2.72 |
| -$6,786 | Net after 1 year | -$1,057 |
| -$7,071 | Net after 2 years | -$2,049 |
| -$7,357 | Net after 3 years | -$3,042 |
| 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
Bitmain Antminer S9j (14.5Th)Score: 31/100. 0 dB noise level.
Best for Efficiency
Antminer S21+16.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21+ or Bitmain Antminer S9j (14.5Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21+ is more profitable at $-0.78/day compared to $-2.72/day for the Bitmain Antminer S9j (14.5Th). 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 S9j (14.5Th) better for noise-sensitive spaces?
The Antminer S21+ is quieter at 75 dB compared to the Bitmain Antminer S9j (14.5Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Antminer S21+ vs Bitmain Antminer S9j (14.5Th): which fits a residential setup better?
The Bitmain Antminer S9j (14.5Th) scores 31/100 on our Home Mining Score (vs 30/100 for the Antminer S21+). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Antminer S21+ and Bitmain Antminer S9j (14.5Th) on J/TH?
The Antminer S21+ runs at 16.5 J/TH while the Bitmain Antminer S9j (14.5Th) runs at 93.1 J/TH — a difference of 76.6 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 82% better efficacité (16.5 vs 93.1 J/TH).