Bitmain Antminer S3 vs MicroBT Whatsminer M21S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S3 | Specification | MicroBT Whatsminer M21S |
|---|---|---|
| 478.0 GH/s | Taux de hachage | 56.0 TH/s |
| 366 W | Consommation électrique | 3,360 W |
| 765.7 J/TH | Efficiency | 60.0 J/TH |
| — | Niveau de bruit | — |
| 5,200.0 kg | Weight | 12,500.0 kg |
| 1,249 BTU/hr | BTU Output | 11,464 BTU/hr |
| 34/100 | Home Mining Score | 22/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S3
MicroBT Whatsminer M21S
Based on BTC price of $78,143 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Weighing six performance factors, the MicroBT Whatsminer M21S comes out ahead — it takes 2 of 4 (efficacité, hashrate). Where it pulls away hardest is 11615% more hashrate (0.5 vs 56.0 TH/s). The Bitmain Antminer S3 claws back ground on consommation électrique and score de minage domestique. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Here is every spec where the Bitmain Antminer S3 and MicroBT Whatsminer M21S actually differ, with the gap quantified:
- MicroBT Whatsminer M21S 11615% more hashrate (0.5 vs 56.0 TH/s)
- Bitmain Antminer S3 89% better power draw (366 vs 3,360 W)
- MicroBT Whatsminer M21S 92% better efficacité (765.7 vs 60.0 J/TH)
- Bitmain Antminer S3 58% better weight (5,200 vs 12,500 kg)
- MicroBT Whatsminer M21S 818% more heat output (1,249 vs 11,464 BTU/hr)
- Bitmain Antminer S3 55% more score de minage domestique (34.0 vs 22.0)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| Bitmain Antminer S3 | Metric | MicroBT Whatsminer M21S |
|---|---|---|
| — | Upfront cost (MSRP) | $650 |
| -$0.86 | Daily net profit | -$6.05 |
| -$314 | Net after 1 year | -$2,858 |
| -$629 | Net after 2 years | -$5,067 |
| -$943 | Net after 3 years | -$7,275 |
| — | 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 S3Score: 34/100. 0 dB noise level.
Best for Efficiency
MicroBT Whatsminer M21S60.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S3 vs MicroBT Whatsminer M21S: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S3 is more profitable at $-0.86/day compared to $-6.05/day for the MicroBT Whatsminer M21S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Bitmain Antminer S3 or the MicroBT Whatsminer M21S better for noise-sensitive spaces?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Bitmain Antminer S3 vs MicroBT Whatsminer M21S: which fits a residential setup better?
The Bitmain Antminer S3 scores 34/100 on our Home Mining Score (vs 22/100 for the MicroBT Whatsminer M21S). 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 S3 and MicroBT Whatsminer M21S on J/TH?
The Bitmain Antminer S3 runs at 765.7 J/TH while the MicroBT Whatsminer M21S runs at 60.0 J/TH — a difference of 705.7 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 92% better efficacité (765.7 vs 60.0 J/TH).