MicroBT WhatsMiner M66S++ (348Th)

The WhatsMiner M66S++ (348Th) is positioned for Bitcoin mining on SHA-256, offering up to 348 TH/s with a defined power draw.

First released in December 2024, it’s commonly evaluated as a step-up path from earlier-generation SHA-256 hardware.

Expect a wall draw near 5394W; that’s the figure most operators use for facility load calculations.

Efficiency is quoted at about 15.50 J/Th, a key metric when electricity rates define profitability.

In the M60 Series lineup, this model is commonly chosen for fleets that standardize on similar power and cooling requirements.

For immersion farms, this form factor integrates cleanly into tanks and high-density layouts.

It’s typically evaluated alongside similar WhatsMiner units based on watts, hashrate, and cooling method.

It’s a sensible pick when you want measurable output, manageable infrastructure requirements, and a WhatsMiner that slots into a mixed fleet.