Bitmain T21 (190TH) vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain T21 (190TH) | Specification | Whatsminer M66S |
|---|---|---|
| 190.0 TH/s | Taux de hachage | 298.0 TH/s |
| 3,610 W | Consommation électrique | 5,518 W |
| 19.0 J/TH | Efficiency | 18.5 J/TH |
| 76 dB | Niveau de bruit | 50 dB |
| 16.4 kg | Weight | 13.5 kg |
| 12,317 BTU/hr | BTU Output | 18,827 BTU/hr |
| 23/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain T21 (190TH)
Whatsminer M66S
Based on BTC price of $78,230 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the Whatsminer M66S edges it: 4 of 6 factors go its way (efficacité, hashrate, score de minage domestique, niveau sonore). The standout gap is 57% more hashrate (190 vs 298 TH/s) in the Whatsminer M66S's favour. The Bitmain T21 (190TH) claws back ground on consommation électrique and rapport qualité-prix. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
The Bitmain T21 (190TH) and Whatsminer M66S diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Whatsminer M66S 57% more hashrate (190 vs 298 TH/s)
- Bitmain T21 (190TH) 35% better power draw (3,610 vs 5,518 W)
- Whatsminer M66S 3% better efficacité (19.0 vs 18.5 J/TH)
- Whatsminer M66S 34% better noise (76.0 vs 50.0 dB)
- Whatsminer M66S 18% better weight (16.4 vs 13.5 kg)
- Whatsminer M66S 53% more heat output (12,317 vs 18,827 BTU/hr)
- Whatsminer M66S 91% more score de minage domestique (23.0 vs 44.0)
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.
| Bitmain T21 (190TH) | Metric | Whatsminer M66S |
|---|---|---|
| $1,700 | Upfront cost (MSRP) | $8,000 |
| -$1.82 | Daily net profit | -$2.52 |
| -$2,366 | Net after 1 year | -$8,918 |
| -$3,032 | Net after 2 years | -$9,836 |
| -$3,697 | Net after 3 years | -$10,754 |
| 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
Whatsminer M66SScore: 44/100. 50 dB noise level.
Best for Efficiency
Whatsminer M66S18.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Bitmain T21 (190TH) or the Whatsminer M66S?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain T21 (190TH) is more profitable at $-1.82/day compared to $-2.52/day for the Whatsminer M66S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain T21 (190TH) or Whatsminer M66S?
The Whatsminer M66S is quieter at 50 dB compared to the Bitmain T21 (190TH) at 76 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Bitmain T21 (190TH) or Whatsminer M66S?
The Whatsminer M66S scores 44/100 on our Home Mining Score (vs 23/100 for the Bitmain T21 (190TH)). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
Bitmain T21 (190TH) vs Whatsminer M66S: how much does the efficiency gap matter?
The Bitmain T21 (190TH) runs at 19.0 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 0.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 3% better efficacité (19.0 vs 18.5 J/TH).