Antminer S21 Pro vs Antminer S21 XP
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Pro | Specification | Antminer S21 XP |
|---|---|---|
| 234.0 TH/s | Hashrate | 270.0 TH/s |
| 3,510 W | Power Consumption | 3,645 W |
| 15.0 J/TH | Efficiency | 13.5 J/TH |
| 75 dB | Noise Level | 75 dB |
| 15.0 kg | Weight | 15.4 kg |
| 11,976 BTU/hr | BTU Output | 12,437 BTU/hr |
| 30/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 Pro
Antminer S21 XP
Based on BTC price of $78,208 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
The S21 XP is Bitmain's flagship air-cooled miner, pushing the limits of what the 21-series platform can achieve. The S21 Pro sits just below it in the lineup.
The S21 XP offers the absolute best air-cooled efficiency in the S21 family, but its premium price means the ROI timeline is longer. The S21 Pro represents the sweet spot of performance versus cost for most operations.
Spec Deltas
Here is every spec where the Antminer S21 Pro and Antminer S21 XP actually differ, with the gap quantified:
- Antminer S21 XP 15% more hashrate (234 vs 270 TH/s)
- Antminer S21 Pro 4% better power draw (3,510 vs 3,645 W)
- Antminer S21 XP 10% better efficiency (15.0 vs 13.5 J/TH)
- Antminer S21 Pro 3% better weight (15.0 vs 15.4 kg)
- Antminer S21 XP 4% more heat output (11,976 vs 12,437 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 S21 Pro | Metric | Antminer S21 XP |
|---|---|---|
| $6,800 | Upfront cost (MSRP) | $8,200 |
| -$0.00 | Daily net profit | $0.97 |
| -$6,801 | Net after 1 year | -$7,846 |
| -$6,802 | Net after 2 years | -$7,492 |
| -$6,803 | Net after 3 years | -$7,139 |
| Does not pay back at current rates (negative daily profit) | Payback period | Takes ~23.2 years to pay back at current rates |
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
Antminer S21 XP$0.97/day higher profit at current rates.
Best for Home Mining
TieBoth miners are equally suitable for home use.
Best for Efficiency
Antminer S21 XP13.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the S21 XP the most efficient air-cooled Bitcoin miner available?
Yes, the S21 XP is among the most efficient air-cooled SHA-256 miners on the market. Only hydro-cooled models (like the S21 Hyd) achieve better efficiency numbers.
Should I buy an S21 Pro or save up for an S21 XP?
If you have low electricity costs under $0.06/kWh, the S21 Pro's lower upfront cost may provide faster ROI. At higher rates, the S21 XP's efficiency advantage becomes worth the premium.