MicroBT Whatsminer M21 vs MicroBT Whatsminer M3X
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21 | Specification | MicroBT Whatsminer M3X |
|---|---|---|
| 31.0 TH/s | Hashrate | 12.5 TH/s |
| 1,860 W | Power Consumption | 2,050 W |
| 60.0 J/TH | Efficiency | 164.0 J/TH |
| — | Noise Level | — |
| 7,150.0 kg | Weight | 7,500.0 kg |
| 6,346 BTU/hr | BTU Output | 6,995 BTU/hr |
| 28/100 | Home Mining Score | 26/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21
MicroBT Whatsminer M3X
Based on BTC price of $79,027 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the MicroBT Whatsminer M21 wins on 4 of 4 factors (efficiency, hashrate, power consumption, home mining score). The standout gap is 63% better efficiency (60.0 vs 164.0 J/TH) in the MicroBT Whatsminer M21's favour. 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 MicroBT Whatsminer M21 and MicroBT Whatsminer M3X actually differ, with the gap quantified:
- MicroBT Whatsminer M21 148% more hashrate (31.0 vs 12.5 TH/s)
- MicroBT Whatsminer M21 9% better power draw (1,860 vs 2,050 W)
- MicroBT Whatsminer M21 63% better efficiency (60.0 vs 164.0 J/TH)
- MicroBT Whatsminer M21 5% better weight (7,150 vs 7,500 kg)
- MicroBT Whatsminer M3X 10% more heat output (6,346 vs 6,995 BTU/hr)
- MicroBT Whatsminer M21 8% more home mining score (28.0 vs 26.0)
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.
| MicroBT Whatsminer M21 | Metric | MicroBT Whatsminer M3X |
|---|---|---|
| — | Upfront cost (MSRP) | $350 |
| -$3.34 | Daily net profit | -$4.47 |
| -$1,218 | Net after 1 year | -$1,980 |
| -$2,436 | Net after 2 years | -$3,610 |
| -$3,654 | Net after 3 years | -$5,240 |
| — | 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
MicroBT Whatsminer M21Score: 28/100. 0 dB noise level.
Best for Efficiency
MicroBT Whatsminer M2160.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the MicroBT Whatsminer M21 or MicroBT Whatsminer M3X more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT Whatsminer M21 is more profitable at $-3.34/day compared to $-4.47/day for the MicroBT Whatsminer M3X. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
MicroBT Whatsminer M21 vs MicroBT Whatsminer M3X: 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 MicroBT Whatsminer M21 or the MicroBT Whatsminer M3X?
The MicroBT Whatsminer M21 scores 28/100 on our Home Mining Score (vs 26/100 for the MicroBT Whatsminer M3X). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the MicroBT Whatsminer M21 and MicroBT Whatsminer M3X on J/TH?
The MicroBT Whatsminer M21 runs at 60.0 J/TH while the MicroBT Whatsminer M3X runs at 164.0 J/TH — a difference of 104.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 63% better efficiency (60.0 vs 164.0 J/TH).