Antminer S21 Pro vs Bitmain Antminer V9 (4Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Pro | Specification | Bitmain Antminer V9 (4Th) |
|---|---|---|
| 234.0 TH/s | Hashrate | 4.0 TH/s |
| 3,510 W | Power Consumption | 1,027 W |
| 15.0 J/TH | Efficiency | 256.8 J/TH |
| 75 dB | Noise Level | — |
| 15.0 kg | Weight | 3,050.0 kg |
| 11,976 BTU/hr | BTU Output | 3,504 BTU/hr |
| 30/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 Pro
Bitmain Antminer V9 (4Th)
Based on BTC price of $66,305 and current network difficulty as of Mar 28, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 Pro wins on 3 of 5 factors (efficiency, hashrate, noise level). The Bitmain Antminer V9 (4Th) holds the edge in power consumption and home mining score. 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
Bitmain Antminer V9 (4Th)Score: 31/100. 0 dB noise level.
Best for Efficiency
Antminer S21 Pro15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 Pro or Bitmain Antminer V9 (4Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 Pro is more profitable at $-1.13/day compared to $-2.34/day for the Bitmain Antminer V9 (4Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 Pro or Bitmain Antminer V9 (4Th)?
The Antminer S21 Pro is quieter at 75 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 Pro or Bitmain Antminer V9 (4Th)?
The Bitmain Antminer V9 (4Th) scores 31/100 on our Home Mining Score (vs 30/100 for the Antminer S21 Pro). 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 Pro and Bitmain Antminer V9 (4Th)?
The Antminer S21 Pro runs at 15.0 J/TH while the Bitmain Antminer V9 (4Th) runs at 256.8 J/TH — a difference of 241.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.