MicroBT Whatsminer M21S vs MicroBT Whatsminer M3
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21S | Specification | MicroBT Whatsminer M3 |
|---|---|---|
| 56.0 TH/s | Hashrate | 12.0 TH/s |
| 3,360 W | Power Consumption | 2,000 W |
| 60.0 J/TH | Efficiency | 166.7 J/TH |
| — | Noise Level | — |
| 12,500.0 kg | Weight | 8,100.0 kg |
| 11,464 BTU/hr | BTU Output | 6,824 BTU/hr |
| 22/100 | Home Mining Score | 28/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21S
MicroBT Whatsminer M3
Based on BTC price of $78,139 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the MicroBT Whatsminer M21S edges it: 2 of 4 factors go its way (efficiency, hashrate). The standout gap is 367% more hashrate (56.0 vs 12.0 TH/s) in the MicroBT Whatsminer M21S's favour. That said, the MicroBT Whatsminer M3 isn't beaten everywhere — it still wins power consumption and home mining score. 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 MicroBT Whatsminer M21S and MicroBT Whatsminer M3 actually differ, with the gap quantified:
- MicroBT Whatsminer M21S 367% more hashrate (56.0 vs 12.0 TH/s)
- MicroBT Whatsminer M3 40% better power draw (3,360 vs 2,000 W)
- MicroBT Whatsminer M21S 64% better efficiency (60.0 vs 166.7 J/TH)
- MicroBT Whatsminer M3 35% better weight (12,500 vs 8,100 kg)
- MicroBT Whatsminer M21S 68% more heat output (11,464 vs 6,824 BTU/hr)
- MicroBT Whatsminer M3 27% more home mining score (22.0 vs 28.0)
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 M21S | Metric | MicroBT Whatsminer M3 |
|---|---|---|
| $650 | Upfront cost (MSRP) | — |
| -$6.05 | Daily net profit | -$4.37 |
| -$2,858 | Net after 1 year | -$1,595 |
| -$5,067 | Net after 2 years | -$3,189 |
| -$7,275 | Net after 3 years | -$4,784 |
| 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
MicroBT Whatsminer M3Score: 28/100. 0 dB noise level.
Best for Efficiency
MicroBT Whatsminer M21S60.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
MicroBT Whatsminer M21S vs MicroBT Whatsminer M3: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT Whatsminer M3 is more profitable at $-4.37/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.
MicroBT Whatsminer M21S vs MicroBT Whatsminer M3: which runs at a lower noise level?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the MicroBT Whatsminer M21S or MicroBT Whatsminer M3?
The MicroBT Whatsminer M3 scores 28/100 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.
What is the efficiency difference between MicroBT Whatsminer M21S and MicroBT Whatsminer M3?
The MicroBT Whatsminer M21S runs at 60.0 J/TH while the MicroBT Whatsminer M3 runs at 166.7 J/TH — a difference of 106.7 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 64% better efficiency (60.0 vs 166.7 J/TH).