Bitmain Antminer S19k Pro vs Bitmain Antminer S21

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

★ Bitmain Antminer S21 is more efficient for Bitcoin mining

Verdict: Bitmain Antminer S19k Pro vs Bitmain Antminer S21

For Bitcoin mining, the Bitmain Antminer S21 is the more efficient choice, delivering roughly 31% more hashrate per watt than the Bitmain Antminer S19k Pro. The Bitmain Antminer S19k Pro draws 740W less, cutting electricity costs by about $454/year at $0.07/kWh. Bottom line: if power efficiency is your priority, the Bitmain Antminer S21 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
Type ASIC ASIC
Algorithm
Hashrate (BTC) 120 TH/s 200 TH/s
Power Draw 2760 W 3500 W
Efficiency 23 J/TH 17.5 J/TH
Supported Coins BTC, BCH BTC, BCH
Release Year N/A N/A

Hashrate & Efficiency per Coin

Coin Bitmain Pro HR Bitmain S21 HR Power A Power B More Efficient
BTC 120 TH/s 200 TH/s 2760 W 3500 W Antminer ✓
BCH 120 TH/s 200 TH/s 2760 W 3500 W Antminer ✓

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 Difference
$0.04/kWh $2.65 $3.36 -$0.71 (A cheaper)
$0.06/kWh $3.97 $5.04 -$1.07 (A cheaper)
$0.07/kWh $4.64 $5.88 -$1.24 (A cheaper)
$0.1/kWh $6.62 $8.40 -$1.78 (A cheaper)
$0.12/kWh $7.95 $10.08 -$2.13 (A cheaper)
$0.15/kWh $9.94 $12.60 -$2.66 (A cheaper)
$0.2/kWh $13.25 $16.80 -$3.55 (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

  • 200 TH/s — strong absolute hashrate for Bitcoin mining
  • Lower acquisition cost than the S21 Pro (~$3,000–3,500)
  • Same chassis and power infrastructure as S21 Pro
  • Less efficient than S21 Pro (17.5 vs 15 J/TH)
  • 3,500 W power draw still requires industrial setup
  • Noise level identical to Pro (75 dB)

Frequently Asked Questions

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

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

For Bitcoin mining, the Bitmain Antminer S19k Pro draws 2760 W while the Bitmain Antminer S21 draws 3500 W. The Bitmain Antminer S19k Pro uses 740 W less power, which at $0.07/kWh saves ~$454 per year in electricity.

Can both the Bitmain Antminer S19k Pro and Bitmain Antminer S21 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

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