Bitmain Antminer A3 (815Gh) vs StrongU STU-U2
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer A3 (815Gh) | Specification | StrongU STU-U2 |
|---|---|---|
| 815.0 GH/s | Hashrate | 7.0 TH/s |
| 1,275 W | Power Consumption | 1,600 W |
| 1,564.4 J/TH | Efficiency | 228.6 J/TH |
| — | Noise Level | — |
| 4,200.0 kg | Weight | 6,500.0 kg |
| 4,350 BTU/hr | BTU Output | 5,459 BTU/hr |
| 31/100 | Home Mining Score | 28/100 |
| — | Release Year | — |
| Blake2b | Algorithm | Blake2b |
| Bitmain | Manufacturer | StrongU |
Profitability Comparison
Bitmain Antminer A3 (815Gh)
StrongU STU-U2
Based on BTC price of $78,208 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the StrongU STU-U2 wins on 3 of 5 factors (efficiency, hashrate, price-performance). The standout gap is 759% more hashrate (0.8 vs 7.0 TH/s) in the StrongU STU-U2's favour. That said, the Bitmain Antminer A3 (815Gh) isn't beaten everywhere — it still wins power consumption and home mining score. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
The Bitmain Antminer A3 (815Gh) and StrongU STU-U2 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- StrongU STU-U2 759% more hashrate (0.8 vs 7.0 TH/s)
- Bitmain Antminer A3 (815Gh) 20% better power draw (1,275 vs 1,600 W)
- StrongU STU-U2 85% better efficiency (1,564 vs 229 J/TH)
- Bitmain Antminer A3 (815Gh) 35% better weight (4,200 vs 6,500 kg)
- StrongU STU-U2 25% more heat output (4,350 vs 5,459 BTU/hr)
- Bitmain Antminer A3 (815Gh) 11% more home mining score (31.0 vs 28.0)
Cost & ROI Over Time
Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.
| Bitmain Antminer A3 (815Gh) | Metric | StrongU STU-U2 |
|---|---|---|
| $29,718 | Upfront cost (MSRP) | $499 |
| -$3.03 | Daily net profit | -$3.59 |
| -$30,824 | Net after 1 year | -$1,809 |
| -$31,930 | Net after 2 years | -$3,118 |
| -$33,037 | Net after 3 years | -$4,428 |
| Does not pay back at current rates (negative daily profit) | 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
TieBoth miners produce similar daily profit.
Best for Home Mining
Bitmain Antminer A3 (815Gh)Score: 31/100. 0 dB noise level.
Best for Efficiency
StrongU STU-U2228.6 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer A3 (815Gh) vs StrongU STU-U2: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer A3 (815Gh) is more profitable at $-3.03/day compared to $-3.59/day for the StrongU STU-U2. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer A3 (815Gh) vs StrongU STU-U2: which runs at a lower noise level?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
For mining at home, should I pick the Bitmain Antminer A3 (815Gh) or the StrongU STU-U2?
The Bitmain Antminer A3 (815Gh) scores 31/100 on our Home Mining Score (vs 28/100 for the StrongU STU-U2). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Bitmain Antminer A3 (815Gh) and StrongU STU-U2 on J/TH?
The Bitmain Antminer A3 (815Gh) runs at 1,564.4 J/TH while the StrongU STU-U2 runs at 228.6 J/TH — a difference of 1,335.9 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 85% better efficiency (1,564 vs 229 J/TH).