Bitmain Antminer S19k Pro vs MicroBT Whatsminer M66S

Mining profitability comparison for Bitcoin (BTC), Bitcoin Cash (BCH)

★ MicroBT Whatsminer M66S is more efficient for Bitcoin mining

Verdict: Bitmain Antminer S19k Pro vs MicroBT Whatsminer M66S

For Bitcoin mining, the MicroBT Whatsminer M66S is the more efficient choice, delivering roughly 99% more hashrate per watt than the Bitmain Antminer S19k Pro. The Bitmain Antminer S19k Pro draws 681W less, cutting electricity costs by about $418/year at $0.07/kWh. Bottom line: if power efficiency is your priority, the MicroBT Whatsminer M66S is the stronger pick — but confirm with your real electricity rate and current hardware prices below, since acquisition cost ultimately drives ROI.

Specifications

Spec Bitmain Antminer S19k Pro MicroBT Whatsminer M66S
Type ASIC ASIC
Algorithm
Hashrate (BTC) 120 TH/s 298 TH/s
Power Draw 2760 W 3441 W
Efficiency 23 J/TH 11.5 J/TH
Supported Coins BTC, BCH BTC, BCH
Release Year N/A N/A

Hashrate & Efficiency per Coin

Coin Bitmain Pro HR MicroBT M66S HR Power A Power B More Efficient
BTC 120 TH/s 298 TH/s 2760 W 3441 W Whatsminer ✓
BCH 120 TH/s 298 TH/s 2760 W 3441 W Whatsminer ✓

Daily Electricity Cost at Different Rates

Electricity cost only (not including coin revenue). Lower is better for any given rate.

Electricity Rate Bitmain Antminer S19k Pro MicroBT Whatsminer M66S Difference
$0.04/kWh $2.65 $3.30 -$0.65 (A cheaper)
$0.06/kWh $3.97 $4.96 -$0.98 (A cheaper)
$0.07/kWh $4.64 $5.78 -$1.14 (A cheaper)
$0.1/kWh $6.62 $8.26 -$1.63 (A cheaper)
$0.12/kWh $7.95 $9.91 -$1.96 (A cheaper)
$0.15/kWh $9.94 $12.39 -$2.45 (A cheaper)
$0.2/kWh $13.25 $16.52 -$3.27 (A cheaper)

Pros & Cons

Bitmain Antminer S19k Pro

  • Lower acquisition cost (~$1,200–$1,600 on secondary market)
  • Moderate power draw (2,760 W) — slightly easier infrastructure
  • Widely available on secondary market globally
  • Less efficient than S21 series (23 vs 15–17.5 J/TH)
  • Thinner profitability margins at higher electricity rates
  • Approaching end of competitiveness as newer models dominate

MicroBT Whatsminer M66S

  • Best efficiency of any MicroBT air-cooled ASIC (11.5 J/TH)
  • 298 TH/s — highest raw hashrate in MicroBT's air-cooled lineup
  • Proven MicroBT reliability at scale; immersion variant available (M66S+)
  • High acquisition cost (~$5,000–$6,500)
  • 3,441 W draw requires dedicated high-amperage circuit
  • MicroBT firmware ecosystem smaller than Bitmain's

Frequently Asked Questions

Is the Bitmain Antminer S19k Pro or MicroBT Whatsminer M66S more profitable for Bitcoin mining?

Based on hashrate-per-watt efficiency, the MicroBT Whatsminer M66S is more efficient for Bitcoin mining. However, actual profitability depends on your electricity cost, hardware acquisition price, and coin price — use the live calculator for exact numbers.

What is the power consumption difference between the Bitmain Antminer S19k Pro and MicroBT Whatsminer M66S?

For Bitcoin mining, the Bitmain Antminer S19k Pro draws 2760 W while the MicroBT Whatsminer M66S draws 3441 W. The Bitmain Antminer S19k Pro uses 681 W less power, which at $0.07/kWh saves ~$418 per year in electricity.

Can both the Bitmain Antminer S19k Pro and MicroBT Whatsminer M66S mine the same coins?

Yes — both units can mine Bitcoin (BTC) and Bitcoin Cash (BCH). You can switch between these coins with a simple pool configuration change.

Which unit has a better ROI?

ROI depends on hardware acquisition price, electricity cost, and coin price trajectory. The more efficient unit (better J/TH or hashrate per watt) will generally have a lower operating cost per coin mined, but the absolute ROI timeline is determined by the purchase price. Always model both units in the MiningReturns calculator with your specific electricity rate and current market prices.

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Calculate real profitability

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