Bitmain Antminer S21+ Hyd (358Th) vs Bitmain Antminer S9 (12.5Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21+ Hyd (358Th) | Specification | Bitmain Antminer S9 (12.5Th) |
|---|---|---|
| 358.0 TH/s | Hashrate | 12.5 TH/s |
| 5,370 W | Power Consumption | 1,225 W |
| 15.0 J/TH | Efficiency | 98.0 J/TH |
| 50 dB | Noise Level | — |
| 12.8 kg | Weight | 4,200.0 kg |
| 18,322 BTU/hr | BTU Output | 4,180 BTU/hr |
| 44/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Bitmain Antminer S21+ Hyd (358Th)
Bitmain Antminer S9 (12.5Th)
Based on BTC price of $79,029 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S21+ Hyd (358Th) comes out ahead — it takes 4 of 6 (efficiency, hashrate, home mining score, noise level). Where it pulls away hardest is 2764% more hashrate (358.0 vs 12.5 TH/s). That said, the Bitmain Antminer S9 (12.5Th) isn't beaten everywhere — it still wins power consumption and price-performance. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Stripped to the numbers, this is how far apart the Bitmain Antminer S21+ Hyd (358Th) and Bitmain Antminer S9 (12.5Th) sit on each measurable spec:
- Bitmain Antminer S21+ Hyd (358Th) 2764% more hashrate (358.0 vs 12.5 TH/s)
- Bitmain Antminer S9 (12.5Th) 77% better power draw (5,370 vs 1,225 W)
- Bitmain Antminer S21+ Hyd (358Th) 85% better efficiency (15.0 vs 98.0 J/TH)
- Bitmain Antminer S21+ Hyd (358Th) 100% better weight (12.8 vs 4,200.0 kg)
- Bitmain Antminer S21+ Hyd (358Th) 338% more heat output (18,322 vs 4,180 BTU/hr)
- Bitmain Antminer S21+ Hyd (358Th) 42% more home mining score (44.0 vs 31.0)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Bitmain Antminer S21+ Hyd (358Th) | Metric | Bitmain Antminer S9 (12.5Th) |
|---|---|---|
| $2,757 | Upfront cost (MSRP) | $65 |
| $0.13 | Daily net profit | -$2.49 |
| -$2,709 | Net after 1 year | -$972 |
| -$2,661 | Net after 2 years | -$1,879 |
| -$2,613 | Net after 3 years | -$2,787 |
| Takes ~57.4 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
Bitmain Antminer S21+ Hyd (358Th)$2.62/day higher profit at current rates.
Best for Home Mining
Bitmain Antminer S21+ Hyd (358Th)Score: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21+ Hyd (358Th)15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Bitmain Antminer S21+ Hyd (358Th) or the Bitmain Antminer S9 (12.5Th)?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21+ Hyd (358Th) is more profitable at $0.13/day compared to $-2.49/day for the Bitmain Antminer S9 (12.5Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S21+ Hyd (358Th) or Bitmain Antminer S9 (12.5Th)?
The Bitmain Antminer S21+ Hyd (358Th) is quieter at 50 dB compared to the Bitmain Antminer S9 (12.5Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Bitmain Antminer S21+ Hyd (358Th) or the Bitmain Antminer S9 (12.5Th)?
The Bitmain Antminer S21+ Hyd (358Th) scores 44/100 on our Home Mining Score (vs 31/100 for the Bitmain Antminer S9 (12.5Th)). 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 Bitmain Antminer S21+ Hyd (358Th) and Bitmain Antminer S9 (12.5Th)?
The Bitmain Antminer S21+ Hyd (358Th) runs at 15.0 J/TH while the Bitmain Antminer S9 (12.5Th) runs at 98.0 J/TH — a difference of 83.0 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 98.0 J/TH).