Bitmain Antminer A3 (815Gh) vs Obelisk SC1 Slim
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer A3 (815Gh) | Specification | Obelisk SC1 Slim |
|---|---|---|
| 815.0 GH/s | Taux de hachage | 550.0 GH/s |
| 1,275 W | Consommation électrique | 450 W |
| 1,564.4 J/TH | Efficiency | 818.2 J/TH |
| — | Niveau de bruit | — |
| 4,200.0 kg | Weight | — |
| 4,350 BTU/hr | BTU Output | 1,535 BTU/hr |
| 31/100 | Home Mining Score | 34/100 |
| — | Release Year | — |
| Blake2b | Algorithme | Blake2b |
| Bitmain | Manufacturer | Obelisk |
Profitability Comparison
Bitmain Antminer A3 (815Gh)
Obelisk SC1 Slim
Based on BTC price of $78,210 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Obelisk SC1 Slim, which leads on 4 of 5 weighted factors (efficacité, consommation électrique, score de minage domestique, rapport qualité-prix). The standout gap is 65% better power draw (1,275 vs 450 W) in the Obelisk SC1 Slim's favour. That said, the Bitmain Antminer A3 (815Gh) isn't beaten everywhere — it still wins hashrate. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
Here is every spec where the Bitmain Antminer A3 (815Gh) and Obelisk SC1 Slim actually differ, with the gap quantified:
- Bitmain Antminer A3 (815Gh) 48% more hashrate (0.8 vs 0.6 TH/s)
- Obelisk SC1 Slim 65% better power draw (1,275 vs 450 W)
- Obelisk SC1 Slim 48% better efficacité (1,564 vs 818 J/TH)
- Bitmain Antminer A3 (815Gh) 183% more heat output (4,350 vs 1,535 BTU/hr)
- Obelisk SC1 Slim 10% more score de minage domestique (31.0 vs 34.0)
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 | Obelisk SC1 Slim |
|---|---|---|
| $29,718 | Upfront cost (MSRP) | $2,600 |
| -$3.03 | Daily net profit | -$1.06 |
| -$30,824 | Net after 1 year | -$2,987 |
| -$31,930 | Net after 2 years | -$3,374 |
| -$33,037 | Net after 3 years | -$3,761 |
| 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
Obelisk SC1 SlimScore: 34/100. 0 dB noise level.
Best for Efficiency
Obelisk SC1 Slim818.2 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer A3 (815Gh) or Obelisk SC1 Slim more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Obelisk SC1 Slim is more profitable at $-1.06/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.
Which is quieter, the Bitmain Antminer A3 (815Gh) or Obelisk SC1 Slim?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the Bitmain Antminer A3 (815Gh) or Obelisk SC1 Slim?
The Obelisk SC1 Slim scores 34/100 on our Home Mining Score (vs 31/100 for the Bitmain Antminer A3 (815Gh)). 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 Obelisk SC1 Slim on J/TH?
The Bitmain Antminer A3 (815Gh) runs at 1,564.4 J/TH while the Obelisk SC1 Slim 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 efficacité (1,564 vs 818 J/TH).