GMO miner B3 vs MicroBT Whatsminer M21
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| GMO miner B3 | Specification | MicroBT Whatsminer M21 |
|---|---|---|
| 33.0 TH/s | Hashrate | 31.0 TH/s |
| 3,417 W | Power Consumption | 1,860 W |
| 103.6 J/TH | Efficiency | 60.0 J/TH |
| — | Noise Level | — |
| 5,000.0 kg | Weight | 7,150.0 kg |
| 11,659 BTU/hr | BTU Output | 6,346 BTU/hr |
| 22/100 | Home Mining Score | 28/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| GMO miner | Manufacturer | MicroBT |
Profitability Comparison
GMO miner B3
MicroBT Whatsminer M21
Based on BTC price of $77,962 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the MicroBT Whatsminer M21 edges it: 3 of 4 factors go its way (efficiency, power consumption, home mining score). The standout gap is 46% better power draw (3,417 vs 1,860 W) in the MicroBT Whatsminer M21's favour. That said, the GMO miner B3 isn't beaten everywhere — it still wins hashrate. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Here is every spec where the GMO miner B3 and MicroBT Whatsminer M21 actually differ, with the gap quantified:
- GMO miner B3 6% more hashrate (33.0 vs 31.0 TH/s)
- MicroBT Whatsminer M21 46% better power draw (3,417 vs 1,860 W)
- MicroBT Whatsminer M21 42% better efficiency (103.6 vs 60.0 J/TH)
- GMO miner B3 30% better weight (5,000 vs 7,150 kg)
- GMO miner B3 84% more heat output (11,659 vs 6,346 BTU/hr)
- MicroBT Whatsminer M21 27% more home mining score (22.0 vs 28.0)
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
Which makes more money, the GMO miner B3 or the MicroBT Whatsminer M21?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT Whatsminer M21 is more profitable at $-3.35/day compared to $-7.02/day for the GMO miner B3. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the GMO miner B3 or MicroBT Whatsminer M21?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
For mining at home, should I pick the GMO miner B3 or the MicroBT Whatsminer M21?
The MicroBT Whatsminer M21 scores 28/100 on our Home Mining Score (vs 22/100 for the GMO miner B3). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the GMO miner B3 and MicroBT Whatsminer M21 on J/TH?
The GMO miner B3 runs at 103.6 J/TH while the MicroBT Whatsminer M21 runs at 60.0 J/TH — a difference of 43.6 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 42% better efficiency (103.6 vs 60.0 J/TH).