Antminer S19k Pro vs Antminer S21
Side-by-side specs, profitability, and home mining comparison.
Quick verdict
For most buyers the Antminer S21 is the stronger pick — New-generation chips deliver dramatically better efficiency than the cost-optimized S19k. The Antminer S19k Pro runs 120.0 TH/s at 23 J/TH; the Antminer S21 runs 200.0 TH/s at 17.5 J/TH.
Specs verified against the D-Central Mining Bible \xc2\xb7 June 2026
Specifications Comparison
| Antminer S19k Pro | Specification | Antminer S21 |
|---|---|---|
| 120.0 TH/s | Hashrate | 200.0 TH/s |
| 2,760 W | Power Consumption | 3,500 W |
| 23.0 J/TH | Efficiency | 17.5 J/TH |
| 75 dB | Noise Level | 75 dB |
| 12.5 kg | Weight | 14.6 kg |
| 9,417 BTU/hr | BTU Output | 11,942 BTU/hr |
| 8/100 | Home Mining Score | 8/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S19k Pro
Antminer S21
Based on BTC price of $60,461 and current network difficulty as of Jun 27, 2026. Actual results vary.
Verdict
The S19k Pro was designed as a cost-optimized variant of the S19 generation. How does it stack up against the next-generation S21?
The S21 wins on efficiency by a wide margin. The S19k Pro was built for value, not peak performance, and the generational gap makes the difference even starker.
Spec Deltas
Here is every spec where the Antminer S19k Pro and Antminer S21 actually differ, with the gap quantified:
- Antminer S21 67% more hashrate (120 vs 200 TH/s)
- Antminer S19k Pro 21% better power draw (2,760 vs 3,500 W)
- Antminer S21 24% better efficiency (23.0 vs 17.5 J/TH)
- Antminer S19k Pro 14% better weight (12.5 vs 14.6 kg)
- Antminer S21 27% more heat output (9,417 vs 11,942 BTU/hr)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| Antminer S19k Pro | Metric | Antminer S21 |
|---|---|---|
| $2,800 | Upfront cost (MSRP) | $5,500 |
| -$3.22 | Daily net profit | -$2.72 |
| -$3,974 | Net after 1 year | -$6,493 |
| -$5,148 | Net after 2 years | -$7,487 |
| -$6,323 | Net after 3 years | -$8,480 |
| 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
TieBoth miners produce similar daily profit.
Best for Home Mining
TieBoth miners are equally suitable for home use.
Best for Efficiency
Antminer S2117.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
What made the S19k Pro different from other S19 models?
The S19k Pro used a different chip binning strategy to achieve lower manufacturing costs. It offers reasonable hashrate at a lower purchase price, trading some efficiency for affordability.
Is the S19k Pro worth buying at used-market prices?
Only at very cheap electricity. The efficiency gap versus the S21 makes the S19k Pro uncompetitive at most power rates.