Bitmain Antminer T9 (12.5Th) vs Bitdeer SealMiner A3 Pro Air
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer T9 (12.5Th) | Specification | Bitdeer SealMiner A3 Pro Air |
|---|---|---|
| 12.5 TH/s | Hashrate | 290.0 TH/s |
| 1,576 W | Power Consumption | 3,625 W |
| 126.1 J/TH | Efficiency | 12.5 J/TH |
| — | Noise Level | 75 dB |
| 3,800.0 kg | Weight | 15.5 kg |
| 5,377 BTU/hr | BTU Output | 12,369 BTU/hr |
| 28/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitdeer |
Profitability Comparison
Bitmain Antminer T9 (12.5Th)
Bitdeer SealMiner A3 Pro Air
Based on BTC price of $79,091 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Bitdeer SealMiner A3 Pro Air, which leads on 5 of 6 weighted factors (efficiency, hashrate, home mining score, noise level, price-performance). The standout gap is 2220% more hashrate (12.5 vs 290.0 TH/s) in the Bitdeer SealMiner A3 Pro Air's favour. That said, the Bitmain Antminer T9 (12.5Th) isn't beaten everywhere — it still wins power consumption. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
The Bitmain Antminer T9 (12.5Th) and Bitdeer SealMiner A3 Pro Air diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitdeer SealMiner A3 Pro Air 2220% more hashrate (12.5 vs 290.0 TH/s)
- Bitmain Antminer T9 (12.5Th) 57% better power draw (1,576 vs 3,625 W)
- Bitdeer SealMiner A3 Pro Air 90% better efficiency (126.1 vs 12.5 J/TH)
- Bitdeer SealMiner A3 Pro Air 100% better weight (3,800.0 vs 15.5 kg)
- Bitdeer SealMiner A3 Pro Air 130% more heat output (5,377 vs 12,369 BTU/hr)
- Bitdeer SealMiner A3 Pro Air 7% more home mining score (28.0 vs 30.0)
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 T9 (12.5Th) | Metric | Bitdeer SealMiner A3 Pro Air |
|---|---|---|
| $1,100 | Upfront cost (MSRP) | $4,895 |
| -$3.33 | Daily net profit | $1.85 |
| -$2,315 | Net after 1 year | -$4,218 |
| -$3,529 | Net after 2 years | -$3,541 |
| -$4,744 | Net after 3 years | -$2,864 |
| Does not pay back at current rates (negative daily profit) | Payback period | Takes ~7.2 years to pay back at current rates |
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
Bitdeer SealMiner A3 Pro Air$5.18/day higher profit at current rates.
Best for Home Mining
Bitdeer SealMiner A3 Pro AirScore: 30/100. 75 dB noise level.
Best for Efficiency
Bitdeer SealMiner A3 Pro Air12.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer T9 (12.5Th) vs Bitdeer SealMiner A3 Pro Air: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitdeer SealMiner A3 Pro Air is more profitable at $1.85/day compared to $-3.33/day for the Bitmain Antminer T9 (12.5Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer T9 (12.5Th) vs Bitdeer SealMiner A3 Pro Air: which runs at a lower noise level?
The Bitdeer SealMiner A3 Pro Air is quieter at 75 dB compared to the Bitmain Antminer T9 (12.5Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Bitmain Antminer T9 (12.5Th) or Bitdeer SealMiner A3 Pro Air?
The Bitdeer SealMiner A3 Pro Air scores 30/100 on our Home Mining Score (vs 28/100 for the Bitmain Antminer T9 (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 T9 (12.5Th) and Bitdeer SealMiner A3 Pro Air?
The Bitmain Antminer T9 (12.5Th) runs at 126.1 J/TH while the Bitdeer SealMiner A3 Pro Air runs at 12.5 J/TH — a difference of 113.6 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 90% better efficiency (126.1 vs 12.5 J/TH).
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