Bitmain Antminer S19j Pro (104Th) vs MicroBT Whatsminer M21S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S19j Pro (104Th) | Specification | MicroBT Whatsminer M21S |
|---|---|---|
| 104.0 TH/s | Hashrate | 56.0 TH/s |
| 3,068 W | Power Consumption | 3,360 W |
| 29.5 J/TH | Efficiency | 60.0 J/TH |
| — | Noise Level | — |
| 13,200.0 kg | Weight | 12,500.0 kg |
| 10,468 BTU/hr | BTU Output | 11,464 BTU/hr |
| 22/100 | Home Mining Score | 22/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S19j Pro (104Th)
MicroBT Whatsminer M21S
Based on BTC price of $79,051 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S19j Pro (104Th) comes out ahead — it takes 4 of 4 (efficiency, hashrate, power consumption, price-performance). Its biggest concrete edge: 51% better efficiency (29.5 vs 60.0 J/TH). Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Here is every spec where the Bitmain Antminer S19j Pro (104Th) and MicroBT Whatsminer M21S actually differ, with the gap quantified:
- Bitmain Antminer S19j Pro (104Th) 86% more hashrate (104.0 vs 56.0 TH/s)
- Bitmain Antminer S19j Pro (104Th) 9% better power draw (3,068 vs 3,360 W)
- Bitmain Antminer S19j Pro (104Th) 51% better efficiency (29.5 vs 60.0 J/TH)
- MicroBT Whatsminer M21S 5% better weight (13,200 vs 12,500 kg)
- MicroBT Whatsminer M21S 10% more heat output (10,468 vs 11,464 BTU/hr)
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 S19j Pro (104Th) | Metric | MicroBT Whatsminer M21S |
|---|---|---|
| $398 | Upfront cost (MSRP) | $650 |
| -$3.58 | Daily net profit | -$6.03 |
| -$1,705 | Net after 1 year | -$2,850 |
| -$3,011 | Net after 2 years | -$5,050 |
| -$4,318 | Net after 3 years | -$7,249 |
| 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
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer S19j Pro (104Th)29.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Bitmain Antminer S19j Pro (104Th) or the MicroBT Whatsminer M21S?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S19j Pro (104Th) is more profitable at $-3.58/day compared to $-6.03/day for the MicroBT Whatsminer M21S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S19j Pro (104Th) or MicroBT Whatsminer M21S?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the Bitmain Antminer S19j Pro (104Th) or MicroBT Whatsminer M21S?
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 S19j Pro (104Th) and MicroBT Whatsminer M21S on J/TH?
The Bitmain Antminer S19j Pro (104Th) runs at 29.5 J/TH while the MicroBT Whatsminer M21S runs at 60.0 J/TH — a difference of 30.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 51% better efficiency (29.5 vs 60.0 J/TH).