Antminer S21 Hydro vs NerdQAxe++
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | NerdQAxe++ |
|---|---|---|
| 335.0 TH/s | Taux de hachage | 4.0 TH/s |
| 5,360 W | Consommation électrique | 120 W |
| 16.0 J/TH | Efficiency | 30.0 J/TH |
| 50 dB | Niveau de bruit | 42 dB |
| 15.8 kg | Weight | 0.5 kg |
| 18,288 BTU/hr | BTU Output | 409 BTU/hr |
| 44/100 | Home Mining Score | 58/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Antminer S21 Hydro
NerdQAxe++
Based on BTC price of $62,527 and current network difficulty as of Jun 4, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Antminer S21 Hydro, which leads on 3 of 6 weighted factors (efficacité, hashrate, rapport qualité-prix). The standout gap is 8275% more hashrate (335.0 vs 4.0 TH/s) in the Antminer S21 Hydro's favour. The NerdQAxe++ claws back ground on consommation électrique and score de minage domestique and niveau sonore. Cross-check the spec deltas and operating-cost table above against your own electricity rate before deciding.
Spec Deltas
Here is every spec where the Antminer S21 Hydro and NerdQAxe++ actually differ, with the gap quantified:
- Antminer S21 Hydro 8275% more hashrate (335.0 vs 4.0 TH/s)
- NerdQAxe++ 98% better power draw (5,360 vs 120 W)
- Antminer S21 Hydro 47% better efficacité (16.0 vs 30.0 J/TH)
- NerdQAxe++ 16% better noise (50.0 vs 42.0 dB)
- NerdQAxe++ 97% better weight (15.8 vs 0.5 kg)
- Antminer S21 Hydro 4367% more heat output (18,288 vs 409 BTU/hr)
- NerdQAxe++ 32% more score de minage domestique (44.0 vs 58.0)
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 Hydro | Metric | NerdQAxe++ |
|---|---|---|
| $9,500 | Upfront cost (MSRP) | $349 |
| -$3.39 | Daily net profit | -$0.17 |
| -$10,736 | Net after 1 year | -$413 |
| -$11,973 | Net after 2 years | -$477 |
| -$13,209 | Net after 3 years | -$540 |
| 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
NerdQAxe++Score: 58/100. 42 dB noise level.
Best for Efficiency
Antminer S21 Hydro16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 Hydro or NerdQAxe++ more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the NerdQAxe++ is more profitable at $-0.17/day compared to $-3.39/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Antminer S21 Hydro vs NerdQAxe++: which runs at a lower noise level?
The NerdQAxe++ is quieter at 42 dB compared to the Antminer S21 Hydro at 50 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21 Hydro or NerdQAxe++?
The NerdQAxe++ scores 58/100 on our Home Mining Score (vs 44/100 for the Antminer S21 Hydro). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Antminer S21 Hydro and NerdQAxe++ on J/TH?
The Antminer S21 Hydro runs at 16.0 J/TH while the NerdQAxe++ runs at 30.0 J/TH — a difference of 14.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 47% better efficacité (16.0 vs 30.0 J/TH).