Antminer S21 XP vs Bitmain Antminer S9j (14.5Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 XP | Specification | Bitmain Antminer S9j (14.5Th) |
|---|---|---|
| 270.0 TH/s | Hashrate | 14.5 TH/s |
| 3,645 W | Power Consumption | 1,350 W |
| 13.5 J/TH | Efficiency | 93.1 J/TH |
| 75 dB | Noise Level | — |
| 15.4 kg | Weight | 4,200.0 kg |
| 12,437 BTU/hr | BTU Output | 4,606 BTU/hr |
| 30/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 XP
Bitmain Antminer S9j (14.5Th)
Based on BTC price of $77,733 and current network difficulty as of Apr 25, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 XP wins on 3 of 6 factors (efficiency, hashrate, noise level). The Bitmain Antminer S9j (14.5Th) holds the edge in power consumption and home mining score and price-performance. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Best For...
Best for Profitability
Antminer S21 XP$3.70/day higher profit at current rates.
Best for Home Mining
Bitmain Antminer S9j (14.5Th)Score: 31/100. 0 dB noise level.
Best for Efficiency
Antminer S21 XP13.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 XP or Bitmain Antminer S9j (14.5Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 XP is more profitable at $0.98/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.
Which is quieter, the Antminer S21 XP or Bitmain Antminer S9j (14.5Th)?
The Antminer S21 XP 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.
Which is better for home mining, the Antminer S21 XP or Bitmain Antminer S9j (14.5Th)?
The Bitmain Antminer S9j (14.5Th) scores 31/100 on our Home Mining Score (vs 30/100 for the Antminer S21 XP). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
What is the efficiency difference between Antminer S21 XP and Bitmain Antminer S9j (14.5Th)?
The Antminer S21 XP runs at 13.5 J/TH while the Bitmain Antminer S9j (14.5Th) runs at 93.1 J/TH — a difference of 79.6 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.