Antminer S21 vs Bitmain Antminer S9i (13Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 | Specification | Bitmain Antminer S9i (13Th) |
|---|---|---|
| 200.0 TH/s | Hashrate | 13.0 TH/s |
| 3,500 W | Power Consumption | 1,280 W |
| 17.5 J/TH | Efficiency | 98.5 J/TH |
| 75 dB | Noise Level | — |
| 14.6 kg | Weight | 4,200.0 kg |
| 11,942 BTU/hr | BTU Output | 4,367 BTU/hr |
| 36/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21
Bitmain Antminer S9i (13Th)
Based on BTC price of $66,318 and current network difficulty as of Mar 28, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 wins on 4 of 6 factors (efficiency, hashrate, home mining score, noise level). The Bitmain Antminer S9i (13Th) holds the edge in power consumption 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
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 (13Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 is more profitable at $-2.17/day compared to $-2.67/day for the Bitmain Antminer S9i (13Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 or Bitmain Antminer S9i (13Th)?
The Antminer S21 is quieter at 75 dB compared to the Bitmain Antminer S9i (13Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21 or Bitmain Antminer S9i (13Th)?
The Antminer S21 scores 36/100 on our Home Mining Score (vs 31/100 for the Bitmain Antminer S9i (13Th)). 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 and Bitmain Antminer S9i (13Th)?
The Antminer S21 runs at 17.5 J/TH while the Bitmain Antminer S9i (13Th) runs at 98.5 J/TH — a difference of 81.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.