Whatsminer M66S vs MicroBT WhatsMiner M78
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Whatsminer M66S | Specification | MicroBT WhatsMiner M78 |
|---|---|---|
| 298.0 TH/s | Hashrate | 464.0 TH/s |
| 5,518 W | Power Consumption | 6,728 W |
| 18.5 J/TH | Efficiency | 14.5 J/TH |
| 50 dB | Noise Level | 75 dB |
| 13.5 kg | Weight | 18.0 kg |
| 18,827 BTU/hr | BTU Output | 22,956 BTU/hr |
| 44/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
Whatsminer M66S
MicroBT WhatsMiner M78
Based on BTC price of $79,051 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the MicroBT WhatsMiner M78, which leads on 2 of 5 weighted factors (efficiency, hashrate). Its biggest concrete edge: 56% more hashrate (298 vs 464 TH/s). The Whatsminer M66S claws back ground on power consumption and home mining score and noise level. 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 Whatsminer M66S and MicroBT WhatsMiner M78 sit on each measurable spec:
- MicroBT WhatsMiner M78 56% more hashrate (298 vs 464 TH/s)
- Whatsminer M66S 18% better power draw (5,518 vs 6,728 W)
- MicroBT WhatsMiner M78 22% better efficiency (18.5 vs 14.5 J/TH)
- Whatsminer M66S 33% better noise (50.0 vs 75.0 dB)
- Whatsminer M66S 25% better weight (13.5 vs 18.0 kg)
- MicroBT WhatsMiner M78 22% more heat output (18,827 vs 22,956 BTU/hr)
- Whatsminer M66S 47% more home mining score (44.0 vs 30.0)
Cost & ROI Over Time
Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.
| Whatsminer M66S | Metric | MicroBT WhatsMiner M78 |
|---|---|---|
| $8,000 | Upfront cost (MSRP) | — |
| -$2.40 | Daily net profit | $0.73 |
| -$8,877 | Net after 1 year | +$267 |
| -$9,754 | Net after 2 years | +$534 |
| -$10,631 | Net after 3 years | +$802 |
| 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 M78$3.13/day higher profit at current rates.
Best for Home Mining
Whatsminer M66SScore: 44/100. 50 dB noise level.
Best for Efficiency
MicroBT WhatsMiner M7814.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Whatsminer M66S or the MicroBT WhatsMiner M78?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT WhatsMiner M78 is more profitable at $0.73/day compared to $-2.40/day for the Whatsminer M66S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Whatsminer M66S vs MicroBT WhatsMiner M78: which runs at a lower noise level?
The Whatsminer M66S is quieter at 50 dB compared to the MicroBT WhatsMiner M78 at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Whatsminer M66S or MicroBT WhatsMiner M78?
The Whatsminer M66S scores 44/100 on our Home Mining Score (vs 30/100 for the MicroBT WhatsMiner M78). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Whatsminer M66S and MicroBT WhatsMiner M78 on J/TH?
The Whatsminer M66S runs at 18.5 J/TH while the MicroBT WhatsMiner M78 runs at 14.5 J/TH — a difference of 4.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 22% better efficiency (18.5 vs 14.5 J/TH).