MicroBT Whatsminer M21S vs MicroBT WhatsMiner M78S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21S | Specification | MicroBT WhatsMiner M78S |
|---|---|---|
| 56.0 TH/s | Hashrate | 498.0 TH/s |
| 3,360 W | Power Consumption | 6,723 W |
| 60.0 J/TH | Efficiency | 13.5 J/TH |
| — | Noise Level | 75 dB |
| 12,500.0 kg | Weight | 18.0 kg |
| 11,464 BTU/hr | BTU Output | 22,939 BTU/hr |
| 22/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21S
MicroBT WhatsMiner M78S
Based on BTC price of $79,227 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the MicroBT WhatsMiner M78S, which leads on 4 of 5 weighted factors (efficiency, hashrate, home mining score, noise level). Its biggest concrete edge: 789% more hashrate (56.0 vs 498.0 TH/s). The MicroBT Whatsminer M21S claws back ground on power consumption. 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 efficiency (60.0 vs 13.5 J/TH)
- MicroBT WhatsMiner M78S 100% better weight (12,500.0 vs 18.0 kg)
- MicroBT WhatsMiner M78S 100% more heat output (11,464 vs 22,939 BTU/hr)
- MicroBT WhatsMiner M78S 36% more home mining score (22.0 vs 30.0)
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) | — |
| -$5.96 | Daily net profit | $2.59 |
| -$2,825 | Net after 1 year | +$945 |
| -$5,000 | Net after 2 years | +$1,889 |
| -$7,175 | Net after 3 years | +$2,834 |
| 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
MicroBT WhatsMiner M78S$8.55/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
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 $2.59/day compared to $-5.96/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?
The MicroBT WhatsMiner M78S scores 30/100 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 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 efficiency (60.0 vs 13.5 J/TH).