Bitmain Antminer A3 (815Gh) vs Obelisk SC1 Dual
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer A3 (815Gh) | Specification | Obelisk SC1 Dual |
|---|---|---|
| 815.0 GH/s | Hashrate | 1.1 TH/s |
| 1,275 W | Power Consumption | 900 W |
| 1,564.4 J/TH | Efficiency | 818.2 J/TH |
| — | Noise Level | — |
| 4,200.0 kg | Weight | — |
| 4,350 BTU/hr | BTU Output | 3,071 BTU/hr |
| 31/100 | Home Mining Score | 31/100 |
| — | Release Year | — |
| Blake2b | Algorithm | Blake2b |
| Bitmain | Manufacturer | Obelisk |
Profitability Comparison
Bitmain Antminer A3 (815Gh)
Obelisk SC1 Dual
Based on BTC price of $78,208 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Obelisk SC1 Dual comes out ahead — it takes 3 of 3 (efficiency, hashrate, power consumption). Where it pulls away hardest is 48% better efficiency (1,564 vs 818 J/TH). Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
The Bitmain Antminer A3 (815Gh) and Obelisk SC1 Dual diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Obelisk SC1 Dual 35% more hashrate (0.8 vs 1.1 TH/s)
- Obelisk SC1 Dual 29% better power draw (1,275 vs 900 W)
- Obelisk SC1 Dual 48% better efficiency (1,564 vs 818 J/TH)
- Bitmain Antminer A3 (815Gh) 42% more heat output (4,350 vs 3,071 BTU/hr)
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 A3 (815Gh) | Metric | Obelisk SC1 Dual |
|---|---|---|
| $29,718 | Upfront cost (MSRP) | — |
| -$3.03 | Daily net profit | -$2.12 |
| -$30,824 | Net after 1 year | -$774 |
| -$31,930 | Net after 2 years | -$1,548 |
| -$33,037 | Net after 3 years | -$2,322 |
| Does not pay back at current rates (negative daily profit) | Payback period | — |
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
TieBoth miners are equally suitable for home use.
Best for Efficiency
Obelisk SC1 Dual818.2 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer A3 (815Gh) or Obelisk SC1 Dual more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Obelisk SC1 Dual is more profitable at $-2.12/day compared to $-3.03/day for the Bitmain Antminer A3 (815Gh). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer A3 (815Gh) vs Obelisk SC1 Dual: 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 Obelisk SC1 Dual?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
How far apart are the Bitmain Antminer A3 (815Gh) and Obelisk SC1 Dual on J/TH?
The Bitmain Antminer A3 (815Gh) runs at 1,564.4 J/TH while the Obelisk SC1 Dual runs at 818.2 J/TH — a difference of 746.2 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 48% better efficiency (1,564 vs 818 J/TH).