Antminer T21 vs Bitaxe Ultra
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer T21 | Specification | Bitaxe Ultra |
|---|---|---|
| 190.0 TH/s | Taux de hachage | 500.0 GH/s |
| 3,610 W | Consommation électrique | 15 W |
| 19.0 J/TH | Efficiency | 30.0 J/TH |
| 75 dB | Niveau de bruit | 35 dB |
| 14.6 kg | Weight | 0.3 kg |
| 12,317 BTU/hr | BTU Output | 51 BTU/hr |
| 30/100 | Home Mining Score | 70/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Antminer T21
Bitaxe Ultra
Based on BTC price of $64,000 and current network difficulty as of Jun 4, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the Antminer T21 edges it: 3 of 6 factors go its way (efficacité, hashrate, rapport qualité-prix). Its biggest concrete edge: 37900% more hashrate (190.0 vs 0.5 TH/s). That said, the Bitaxe Ultra isn't beaten everywhere — it still wins 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
Stripped to the numbers, this is how far apart the Antminer T21 and Bitaxe Ultra sit on each measurable spec:
- Antminer T21 37900% more hashrate (190.0 vs 0.5 TH/s)
- Bitaxe Ultra 100% better power draw (3,610.0 vs 15.0 W)
- Antminer T21 37% better efficacité (19.0 vs 30.0 J/TH)
- Bitaxe Ultra 53% better noise (75.0 vs 35.0 dB)
- Bitaxe Ultra 98% better weight (14.6 vs 0.3 kg)
- Antminer T21 23957% more heat output (12,317.3 vs 51.2 BTU/hr)
- Bitaxe Ultra 133% more score de minage domestique (30.0 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 T21 | Metric | Bitaxe Ultra |
|---|---|---|
| $4,200 | Upfront cost (MSRP) | $79 |
| -$3.16 | Daily net profit | -$0.02 |
| -$5,354 | Net after 1 year | -$87 |
| -$6,509 | Net after 2 years | -$95 |
| -$7,663 | Net after 3 years | -$103 |
| 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
Bitaxe UltraScore: 70/100. 35 dB noise level.
Best for Efficiency
Antminer T2119.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer T21 vs Bitaxe Ultra: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitaxe Ultra is more profitable at $-0.02/day compared to $-3.16/day for the Antminer T21. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer T21 or Bitaxe Ultra?
The Bitaxe Ultra is quieter at 35 dB compared to the Antminer T21 at 75 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Antminer T21 or the Bitaxe Ultra?
The Bitaxe Ultra scores 70/100 on our Home Mining Score (vs 30/100 for the Antminer T21). 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 T21 and Bitaxe Ultra on J/TH?
The Antminer T21 runs at 19.0 J/TH while the Bitaxe Ultra runs at 30.0 J/TH — a difference of 11.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 37% better efficacité (19.0 vs 30.0 J/TH).