MicroBT Whatsminer M21S vs MicroBT WhatsMiner M78S
Side-by-side specs, profitability, and home mining comparison.
Quick verdict
For most buyers the MicroBT WhatsMiner M78S is the stronger pick — it leads on 3 of 4 head-to-head factors. The MicroBT Whatsminer M21S runs 56.0 TH/s at 60 J/TH; the MicroBT WhatsMiner M78S runs 498.0 TH/s at 13.5 J/TH.
Specs verified against the D-Central Mining Bible \xc2\xb7 June 2026
Specifications Comparison
| MicroBT Whatsminer M21S | Specification | MicroBT WhatsMiner M78S |
|---|---|---|
| 56.0 TH/s | Taux de hachage | 498.0 TH/s |
| 3,360 W | Consommation électrique | 6,723 W |
| 60.0 J/TH | Efficiency | 13.5 J/TH |
| — | Niveau de bruit | 75 dB |
| 12.5 kg | Weight | 18.0 kg |
| 11,464 BTU/hr | BTU Output | 22,939 BTU/hr |
| 8/100 | Home Mining Score | 8/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21S
MicroBT WhatsMiner M78S
Based on BTC price of $62,815 and current network difficulty as of Jun 24, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the MicroBT WhatsMiner M78S, which leads on 3 of 4 weighted factors (efficacité, hashrate, niveau sonore). Its biggest concrete edge: 789% more hashrate (56.0 vs 498.0 TH/s). The MicroBT Whatsminer M21S claws back ground on consommation électrique. 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 M21S and MicroBT WhatsMiner M78S actually differ, with the gap quantified:
- MicroBT WhatsMiner M78S 789% more hashrate (56.0 vs 498.0 TH/s)
- MicroBT Whatsminer M21S 50% better power draw (3,360 vs 6,723 W)
- MicroBT WhatsMiner M78S 78% better efficacité (60.0 vs 13.5 J/TH)
- MicroBT Whatsminer M21S 31% better weight (12.5 vs 18.0 kg)
- MicroBT WhatsMiner M78S 100% more heat output (11,464 vs 22,939 BTU/hr)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| MicroBT Whatsminer M21S | Metric | MicroBT WhatsMiner M78S |
|---|---|---|
| $650 | Upfront cost (MSRP) | — |
| -$6.29 | Daily net profit | -$0.39 |
| -$2,947 | Net after 1 year | -$144 |
| -$5,245 | Net after 2 years | -$288 |
| -$7,542 | Net after 3 years | -$432 |
| 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
TieBoth miners are equally suitable for home use.
Best for Efficiency
MicroBT WhatsMiner M78S13.5 J/TH — lower electricity cost per terahash.
Foire aux questions
MicroBT Whatsminer M21S vs MicroBT WhatsMiner M78S: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT WhatsMiner M78S is more profitable at $-0.39/day compared to $-6.29/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 M78S: which runs at a lower noise level?
The MicroBT WhatsMiner M78S is quieter at 75 dB compared to the MicroBT Whatsminer M21S at 0 dB. For home mining, lower noise levels make a significant difference in livability.
MicroBT Whatsminer M21S vs MicroBT WhatsMiner M78S: which fits a residential setup better?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
What is the efficiency difference between MicroBT Whatsminer M21S and MicroBT WhatsMiner M78S?
The MicroBT Whatsminer M21S 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 efficacité (60.0 vs 13.5 J/TH).