Antminer S21 Hydro vs NerdAxe
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | NerdAxe |
|---|---|---|
| 335.0 TH/s | Taux de hachage | 500.0 GH/s |
| 5,360 W | Consommation électrique | 12 W |
| 16.0 J/TH | Efficiency | 24.0 J/TH |
| 50 dB | Niveau de bruit | 30 dB |
| 15.8 kg | Weight | 0.2 kg |
| 18,288 BTU/hr | BTU Output | 41 BTU/hr |
| 44/100 | Home Mining Score | 70/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Antminer S21 Hydro
NerdAxe
Based on BTC price of $62,822 and current network difficulty as of Jun 4, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the Antminer S21 Hydro edges it: 3 of 6 factors go its way (efficacité, hashrate, rapport qualité-prix). Its biggest concrete edge: 66900% more hashrate (335.0 vs 0.5 TH/s). The NerdAxe holds the edge in 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 NerdAxe actually differ, with the gap quantified:
- Antminer S21 Hydro 66900% more hashrate (335.0 vs 0.5 TH/s)
- NerdAxe 100% better power draw (5,360.0 vs 12.0 W)
- Antminer S21 Hydro 33% better efficacité (16.0 vs 24.0 J/TH)
- NerdAxe 40% better noise (50.0 vs 30.0 dB)
- NerdAxe 99% better weight (15.8 vs 0.2 kg)
- Antminer S21 Hydro 44615% more heat output (18,288.3 vs 40.9 BTU/hr)
- NerdAxe 59% more score de minage domestique (44.0 vs 70.0)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Antminer S21 Hydro | Metric | NerdAxe |
|---|---|---|
| $9,500 | Upfront cost (MSRP) | $69 |
| -$3.34 | Daily net profit | -$0.01 |
| -$10,720 | Net after 1 year | -$74 |
| -$11,940 | Net after 2 years | -$80 |
| -$13,161 | Net after 3 years | -$85 |
| 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
NerdAxeScore: 70/100. 30 dB noise level.
Best for Efficiency
Antminer S21 Hydro16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer S21 Hydro vs NerdAxe: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the NerdAxe is more profitable at $-0.01/day compared to $-3.34/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 Hydro or NerdAxe?
The NerdAxe is quieter at 30 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 NerdAxe?
The NerdAxe scores 70/100 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.
What is the efficiency difference between Antminer S21 Hydro and NerdAxe?
The Antminer S21 Hydro runs at 16.0 J/TH while the NerdAxe runs at 24.0 J/TH — a difference of 8.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 33% better efficacité (16.0 vs 24.0 J/TH).