Antminer S21 Hydro vs Bitmain Antminer V9 (4Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | Bitmain Antminer V9 (4Th) |
|---|---|---|
| 335.0 TH/s | Hashrate | 4.0 TH/s |
| 5,360 W | Power Consumption | 1,027 W |
| 16.0 J/TH | Efficiency | 256.8 J/TH |
| 50 dB | Noise Level | — |
| 15.8 kg | Weight | 3,050.0 kg |
| 18,288 BTU/hr | BTU Output | 3,504 BTU/hr |
| 44/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 Hydro
Bitmain Antminer V9 (4Th)
Based on BTC price of $71,466 and current network difficulty as of Mar 25, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 Hydro wins on 4 of 5 factors (efficiency, hashrate, home mining score, noise level). The Bitmain Antminer V9 (4Th) holds the edge in power consumption. 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 S21 HydroScore: 44/100. 50 dB noise level.
Best for Efficiency
Antminer S21 Hydro16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 Hydro or Bitmain Antminer V9 (4Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer V9 (4Th) is more profitable at $-2.34/day compared to $-2.49/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 Hydro or Bitmain Antminer V9 (4Th)?
The Antminer S21 Hydro is quieter at 50 dB compared to the Bitmain Antminer V9 (4Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21 Hydro or Bitmain Antminer V9 (4Th)?
The Antminer S21 Hydro scores 44/100 on our Home Mining Score (vs 31/100 for the Bitmain Antminer V9 (4Th)). 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 Hydro and Bitmain Antminer V9 (4Th)?
The Antminer S21 Hydro runs at 16.0 J/TH while the Bitmain Antminer V9 (4Th) runs at 256.8 J/TH — a difference of 240.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.