MicroBT Whatsminer M21 vs MicroBT WhatsMiner M78S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21 | Specification | MicroBT WhatsMiner M78S |
|---|---|---|
| 31.0 TH/s | Hashrate | 498.0 TH/s |
| 1,860 W | Power Consumption | 6,723 W |
| 60.0 J/TH | Efficiency | 13.5 J/TH |
| — | Noise Level | 75 dB |
| 7,150.0 kg | Weight | 18.0 kg |
| 6,346 BTU/hr | BTU Output | 22,939 BTU/hr |
| 28/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21
MicroBT WhatsMiner M78S
Based on BTC price of $79,081 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the MicroBT WhatsMiner M78S edges it: 4 of 5 factors go its way (efficiency, hashrate, home mining score, noise level). Where it pulls away hardest is 1506% more hashrate (31.0 vs 498.0 TH/s). The MicroBT Whatsminer M21 holds the edge in power consumption. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
Stripped to the numbers, this is how far apart the MicroBT Whatsminer M21 and MicroBT WhatsMiner M78S sit on each measurable spec:
- MicroBT WhatsMiner M78S 1506% more hashrate (31.0 vs 498.0 TH/s)
- MicroBT Whatsminer M21 72% better power draw (1,860 vs 6,723 W)
- MicroBT WhatsMiner M78S 78% better efficiency (60.0 vs 13.5 J/TH)
- MicroBT WhatsMiner M78S 100% better weight (7,150.0 vs 18.0 kg)
- MicroBT WhatsMiner M78S 261% more heat output (6,346 vs 22,939 BTU/hr)
- MicroBT WhatsMiner M78S 7% more home mining score (28.0 vs 30.0)
Best For...
Best for Profitability
MicroBT WhatsMiner M78S$5.32/day higher profit at current rates.
Best for Home Mining
MicroBT WhatsMiner M78SScore: 30/100. 75 dB noise level.
Best for Efficiency
MicroBT WhatsMiner M78S13.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the MicroBT Whatsminer M21 or the MicroBT WhatsMiner M78S?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT WhatsMiner M78S is more profitable at $1.99/day compared to $-3.34/day for the MicroBT Whatsminer M21. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the MicroBT Whatsminer M21 or the MicroBT WhatsMiner M78S better for noise-sensitive spaces?
The MicroBT WhatsMiner M78S is quieter at 75 dB compared to the MicroBT Whatsminer M21 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the MicroBT Whatsminer M21 or the MicroBT WhatsMiner M78S?
The MicroBT WhatsMiner M78S scores 30/100 on our Home Mining Score (vs 28/100 for the MicroBT Whatsminer M21). 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 M21 and MicroBT WhatsMiner M78S?
The MicroBT Whatsminer M21 runs at 60.0 J/TH while the MicroBT WhatsMiner M78S runs at 13.5 J/TH — a difference of 46.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 78% better efficiency (60.0 vs 13.5 J/TH).