Bitmain Antminer S19k Pro vs Bitmain Antminer S21 Pro

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

★ Bitmain Antminer S21 Pro is more efficient for Bitcoin mining

Verdict: Bitmain Antminer S19k Pro vs Bitmain Antminer S21 Pro

For Bitcoin mining, the Bitmain Antminer S21 Pro is the more efficient choice, delivering roughly 53% more hashrate per watt than the Bitmain Antminer S19k Pro. The Bitmain Antminer S19k Pro draws 750W less, cutting electricity costs by about $460/year at $0.07/kWh. Bottom line: if power efficiency is your priority, the Bitmain Antminer S21 Pro 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 Bitmain Antminer S21 Pro
Type ASIC ASIC
Algorithm
Hashrate (BTC) 120 TH/s 234 TH/s
Power Draw 2760 W 3510 W
Efficiency 23 J/TH 15 J/TH
Supported Coins BTC, BCH BTC, BCH
Release Year N/A N/A

Hashrate & Efficiency per Coin

Coin Bitmain Pro HR Bitmain Pro HR Power A Power B More Efficient
BTC 120 TH/s 234 TH/s 2760 W 3510 W S21 ✓
BCH 120 TH/s 234 TH/s 2760 W 3510 W S21 ✓

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 Bitmain Antminer S21 Pro Difference
$0.04/kWh $2.65 $3.37 -$0.72 (A cheaper)
$0.06/kWh $3.97 $5.05 -$1.08 (A cheaper)
$0.07/kWh $4.64 $5.90 -$1.26 (A cheaper)
$0.1/kWh $6.62 $8.42 -$1.80 (A cheaper)
$0.12/kWh $7.95 $10.11 -$2.16 (A cheaper)
$0.15/kWh $9.94 $12.64 -$2.70 (A cheaper)
$0.2/kWh $13.25 $16.85 -$3.60 (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

Bitmain Antminer S21 Pro

  • Highest hashrate in Bitmain's S21 lineup (234 TH/s)
  • Best-in-class SHA-256 efficiency at 15 J/TH
  • Mature Bitmain firmware ecosystem with BOS+ support
  • High acquisition cost ($4,000–$5,000 new)
  • 3,510 W draw requires a dedicated 16 A / 220 V circuit
  • 75 dB noise — unsuitable for residential environments

Frequently Asked Questions

Is the Bitmain Antminer S19k Pro or Bitmain Antminer S21 Pro more profitable for Bitcoin mining?

Based on hashrate-per-watt efficiency, the Bitmain Antminer S21 Pro 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 Bitmain Antminer S21 Pro?

For Bitcoin mining, the Bitmain Antminer S19k Pro draws 2760 W while the Bitmain Antminer S21 Pro draws 3510 W. The Bitmain Antminer S19k Pro uses 750 W less power, which at $0.07/kWh saves ~$460 per year in electricity.

Can both the Bitmain Antminer S19k Pro and Bitmain Antminer S21 Pro 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.

More Comparisons

Calculate real profitability

Enter your electricity rate for live earnings estimates on both units.

Pro Review Pro Review Open Calculator →