Whatsminer M30S++ (Hydro)

Hashrate 112.0 TH/s Power 3,472 W Efficiency 31.0 J/TH

Whatsminer M66S

Hashrate 298.0 TH/s Power 5,518 W Efficiency 18.5 J/TH

Whatsminer M30S++ (Hydro) vs Whatsminer M66S

Side-by-side specs, profitability, and home mining comparison.

Specifications Comparison

Whatsminer M30S++ (Hydro)	Specification	Whatsminer M66S
112.0 TH/s	Hashrate	298.0 TH/s
3,472 W	Power Consumption	5,518 W
31.0 J/TH	Efficiency	18.5 J/TH
50 dB	Noise Level	50 dB
12.0 kg	Weight	13.5 kg
11,847 BTU/hr	BTU Output	18,827 BTU/hr
50/100	Home Mining Score	44/100
—	Release Year	—
SHA-256	Algorithm	SHA-256
MicroBT	Manufacturer	MicroBT

Profitability Comparison

Electricity Rate:

$/kWh

Whatsminer M30S++ (Hydro)

Daily Revenue 0.00005154 BTC $3.97

Daily Electricity -$8.33

Daily Profit -$4.37

Monthly -$130.95

Yearly -$1,593.26

Whatsminer M66S

Daily Revenue 0.00013713 BTC $10.56

Daily Electricity -$13.24

Daily Profit -$2.69

Monthly -$80.59

Yearly -$980.50

Based on BTC price of $76,982 and current network difficulty as of May 18, 2026. Actual results vary.

Verdict

Weighing six performance factors, the Whatsminer M66S comes out ahead — it takes 2 of 5 (efficiency, hashrate). Its biggest concrete edge: 166% more hashrate (112 vs 298 TH/s). That said, the Whatsminer M30S++ (Hydro) isn't beaten everywhere — it still wins power consumption and home mining score and price-performance. Cross-check the spec deltas and operating-cost table above against your own electricity rate before deciding.

Winner: Whatsminer M66S — wins on 3 of 5 factors

Spec Deltas

Here is every spec where the Whatsminer M30S++ (Hydro) and Whatsminer M66S actually differ, with the gap quantified:

Whatsminer M66S 166% more hashrate (112 vs 298 TH/s)
Whatsminer M30S++ (Hydro) 37% better power draw (3,472 vs 5,518 W)
Whatsminer M66S 40% better efficiency (31.0 vs 18.5 J/TH)
Whatsminer M30S++ (Hydro) 11% better weight (12.0 vs 13.5 kg)
Whatsminer M66S 59% more heat output (11,847 vs 18,827 BTU/hr)
Whatsminer M30S++ (Hydro) 14% more home mining score (50.0 vs 44.0)

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 M30S++ (Hydro)	Metric	Whatsminer M66S
$3,000	Upfront cost (MSRP)	$8,000
-$4.37	Daily net profit	-$2.69
-$4,593	Net after 1 year	-$8,981
-$6,187	Net after 2 years	-$9,961
-$7,780	Net after 3 years	-$10,942
Does not pay back at current rates (negative daily profit)	Payback period	Does not pay back at current rates (negative daily profit)

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

Tie

Both miners produce similar daily profit.

Best for Home Mining

Whatsminer M30S++ (Hydro)

Score: 50/100. 50 dB noise level.

Best for Efficiency

Whatsminer M66S

18.5 J/TH — lower electricity cost per terahash.

Frequently Asked Questions

Is the Whatsminer M30S++ (Hydro) or Whatsminer M66S more profitable?

At the current BTC price and a $0.10/kWh electricity rate, the Whatsminer M66S is more profitable at $-2.69/day compared to $-4.37/day for the Whatsminer M30S++ (Hydro). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.

Is the Whatsminer M30S++ (Hydro) or the Whatsminer M66S better for noise-sensitive spaces?

Both miners have similar noise levels. Check the specs table above for exact decibel readings.

Which is better for home mining, the Whatsminer M30S++ (Hydro) or Whatsminer M66S?

The Whatsminer M30S++ (Hydro) scores 50/100 on our Home Mining Score (vs 44/100 for the Whatsminer M66S). 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 Whatsminer M30S++ (Hydro) and Whatsminer M66S?

The Whatsminer M30S++ (Hydro) runs at 31.0 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 12.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 40% better efficiency (31.0 vs 18.5 J/TH).

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