Bitmain Antminer A3 (815Gh) vs Obelisk SC1
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer A3 (815Gh) | Specification | Obelisk SC1 |
|---|---|---|
| 815.0 GH/s | Hashrate | 550.0 GH/s |
| 1,275 W | Power Consumption | 500 W |
| 1,564.4 J/TH | Efficiency | 909.1 J/TH |
| — | Noise Level | — |
| 4,200.0 kg | Weight | 9,000.0 kg |
| 4,350 BTU/hr | BTU Output | 1,706 BTU/hr |
| 31/100 | Home Mining Score | 34/100 |
| — | Release Year | — |
| Blake2b | Algorithm | Blake2b |
| Bitmain | Manufacturer | Obelisk |
Profitability Comparison
Bitmain Antminer A3 (815Gh)
Obelisk SC1
Based on BTC price of $78,208 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Obelisk SC1, which leads on 3 of 4 weighted factors (efficiency, power consumption, home mining score). The standout gap is 61% better power draw (1,275 vs 500 W) in the Obelisk SC1's favour. The Bitmain Antminer A3 (815Gh) holds the edge in hashrate. 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 Obelisk SC1 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer A3 (815Gh) 48% more hashrate (0.8 vs 0.6 TH/s)
- Obelisk SC1 61% better power draw (1,275 vs 500 W)
- Obelisk SC1 42% better efficiency (1,564 vs 909 J/TH)
- Bitmain Antminer A3 (815Gh) 53% better weight (4,200 vs 9,000 kg)
- Bitmain Antminer A3 (815Gh) 155% more heat output (4,350 vs 1,706 BTU/hr)
- Obelisk SC1 10% more home mining score (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 |
|---|---|---|
| $29,718 | Upfront cost (MSRP) | — |
| -$3.03 | Daily net profit | -$1.18 |
| -$30,824 | Net after 1 year | -$431 |
| -$31,930 | Net after 2 years | -$862 |
| -$33,037 | Net after 3 years | -$1,292 |
| 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
Obelisk SC1Score: 34/100. 0 dB noise level.
Best for Efficiency
Obelisk SC1909.1 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer A3 (815Gh) vs Obelisk SC1: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Obelisk SC1 is more profitable at $-1.18/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: 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?
The Obelisk SC1 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.
What is the efficiency difference between Bitmain Antminer A3 (815Gh) and Obelisk SC1?
The Bitmain Antminer A3 (815Gh) runs at 1,564.4 J/TH while the Obelisk SC1 runs at 909.1 J/TH — a difference of 655.3 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 42% better efficiency (1,564 vs 909 J/TH).