Bitmain Antminer S21 XP Hyd vs PiAxe
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21 XP Hyd | Specification | PiAxe |
|---|---|---|
| 473.0 TH/s | Hashrate | 500.0 GH/s |
| 5,676 W | Power Consumption | 15 W |
| 12.0 J/TH | Efficiency | 30.0 J/TH |
| 50 dB | Noise Level | 30 dB |
| 12.3 kg | Weight | 0.2 kg |
| 19,367 BTU/hr | BTU Output | 51 BTU/hr |
| 44/100 | Home Mining Score | 70/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Bitmain Antminer S21 XP Hyd
PiAxe
Based on BTC price of $79,086 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the Bitmain Antminer S21 XP Hyd edges it: 3 of 6 factors go its way (efficiency, hashrate, price-performance). The standout gap is 94500% more hashrate (473.0 vs 0.5 TH/s) in the Bitmain Antminer S21 XP Hyd's favour. The PiAxe holds the edge in power consumption and home mining score and noise level. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Stripped to the numbers, this is how far apart the Bitmain Antminer S21 XP Hyd and PiAxe sit on each measurable spec:
- Bitmain Antminer S21 XP Hyd 94500% more hashrate (473.0 vs 0.5 TH/s)
- PiAxe 100% better power draw (5,676.0 vs 15.0 W)
- Bitmain Antminer S21 XP Hyd 60% better efficiency (12.0 vs 30.0 J/TH)
- PiAxe 40% better noise (50.0 vs 30.0 dB)
- PiAxe 98% better weight (12.3 vs 0.2 kg)
- Bitmain Antminer S21 XP Hyd 37725% more heat output (19,366.5 vs 51.2 BTU/hr)
- PiAxe 59% more home mining score (44.0 vs 70.0)
Cost & ROI Over Time
Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.
| Bitmain Antminer S21 XP Hyd | Metric | PiAxe |
|---|---|---|
| $5,099 | Upfront cost (MSRP) | $79 |
| $3.59 | Daily net profit | -$0.02 |
| -$3,788 | Net after 1 year | -$85 |
| -$2,477 | Net after 2 years | -$92 |
| -$1,166 | Net after 3 years | -$98 |
| Takes ~3.9 years to pay back at current rates | 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
Bitmain Antminer S21 XP Hyd$3.61/day higher profit at current rates.
Best for Home Mining
PiAxeScore: 70/100. 30 dB noise level.
Best for Efficiency
Bitmain Antminer S21 XP Hyd12.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer S21 XP Hyd or PiAxe more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 XP Hyd is more profitable at $3.59/day compared to $-0.02/day for the PiAxe. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer S21 XP Hyd vs PiAxe: which runs at a lower noise level?
The PiAxe is quieter at 30 dB compared to the Bitmain Antminer S21 XP Hyd at 50 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Bitmain Antminer S21 XP Hyd or the PiAxe?
The PiAxe scores 70/100 on our Home Mining Score (vs 44/100 for the Bitmain Antminer S21 XP Hyd). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Bitmain Antminer S21 XP Hyd and PiAxe on J/TH?
The Bitmain Antminer S21 XP Hyd runs at 12.0 J/TH while the PiAxe runs at 30.0 J/TH — a difference of 18.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 60% better efficiency (12.0 vs 30.0 J/TH).