Antminer S21 Pro vs Bitmain Antminer S9 (13Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Pro | Specification | Bitmain Antminer S9 (13Th) |
|---|---|---|
| 234.0 TH/s | Hashrate | 13.0 TH/s |
| 3,510 W | Power Consumption | 1,300 W |
| 15.0 J/TH | Efficiency | 100.0 J/TH |
| 75 dB | Noise Level | — |
| 15.0 kg | Weight | 4,200.0 kg |
| 11,976 BTU/hr | BTU Output | 4,436 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 S9 (13Th)
Based on BTC price of $79,082 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 Pro wins on 3 of 6 factors (efficiency, hashrate, noise level). Where it pulls away hardest is 1700% more hashrate (234.0 vs 13.0 TH/s). That said, the Bitmain Antminer S9 (13Th) isn't beaten everywhere — it still wins 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.
Spec Deltas
The Antminer S21 Pro and Bitmain Antminer S9 (13Th) diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Antminer S21 Pro 1700% more hashrate (234.0 vs 13.0 TH/s)
- Bitmain Antminer S9 (13Th) 63% better power draw (3,510 vs 1,300 W)
- Antminer S21 Pro 85% better efficiency (15.0 vs 100.0 J/TH)
- Antminer S21 Pro 100% better weight (15.0 vs 4,200.0 kg)
- Antminer S21 Pro 170% more heat output (11,976 vs 4,436 BTU/hr)
- Bitmain Antminer S9 (13Th) 3% more home mining score (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 Pro | Metric | Bitmain Antminer S9 (13Th) |
|---|---|---|
| $6,800 | Upfront cost (MSRP) | $65 |
| $0.09 | Daily net profit | -$2.65 |
| -$6,767 | Net after 1 year | -$1,031 |
| -$6,733 | Net after 2 years | -$1,997 |
| -$6,700 | Net after 3 years | -$2,963 |
| Takes ~203.0 years to pay back at current rates | 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
Antminer S21 Pro$2.74/day higher profit at current rates.
Best for Home Mining
Bitmain Antminer S9 (13Th)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 S9 (13Th) more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 Pro is more profitable at $0.09/day compared to $-2.65/day for the Bitmain Antminer S9 (13Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Antminer S21 Pro vs Bitmain Antminer S9 (13Th): which runs at a lower noise level?
The Antminer S21 Pro is quieter at 75 dB compared to the Bitmain Antminer S9 (13Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Antminer S21 Pro or the Bitmain Antminer S9 (13Th)?
The Bitmain Antminer S9 (13Th) 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.
Antminer S21 Pro vs Bitmain Antminer S9 (13Th): how much does the efficiency gap matter?
The Antminer S21 Pro runs at 15.0 J/TH while the Bitmain Antminer S9 (13Th) runs at 100.0 J/TH — a difference of 85.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 85% better efficiency (15.0 vs 100.0 J/TH).