The Antminer S19 Pro was the high-end member of Bitmain’s 2020 S19 line, built on the 7nm BM1398 chip. It delivers about 110 TH/s at roughly 3,250 W, for an efficiency near 29.5 J/TH — noticeably better than the base S19. It is now an older machine relative to the S21 generation, but the S19 Pro remains one of the most common and serviceable Antminers in the field. This guide gives the real specs and internals, written from D-Central’s bench experience repairing the S19 family.
| Specification | Detail |
|---|---|
| Model | Antminer S19 Pro |
| Manufacturer | Bitmain |
| Algorithm | SHA-256 (Bitcoin / Bitcoin Cash) |
| ASIC chip | BM1398 (7nm) |
| Hashrate | 110 TH/s (a 105 TH/s bin also shipped) |
| Power draw | 3,250 W |
| Efficiency | ~29.5 J/TH |
| Hash boards / chips | 3 boards · 114 chips per board (342 total) |
| Voltage domains | 38 per board, 3 chips per domain (~0.32 V/domain) |
| Release | 2020 |
| Dimensions | 370 × 195.5 × 290 mm |
| Weight | 13.2 kg |
| Noise | ~75 dB |
| Cooling | Dual axial fans, forced air |
Antminer S19 Pro specifications, explained
Hash rate
The S19 Pro shipped primarily as a 110 TH/s machine (with a 105 TH/s bin). That extra hashrate over the base S19 comes from packing more chips onto each board — three chips per voltage domain instead of two — rather than from a new chip. As always on aging hardware, the practical question on a used unit is how much of that rated hashrate is still live across all three boards.
Power and efficiency
At roughly 3,250 W the S19 Pro’s efficiency sits near 29.5 J/TH — the best of the original 2020 S19 line, but still well above the 15–17.5 J/TH of current S21-class miners. For owners, that means the S19 Pro is viable on cheap power or as a heat source, and marginal at typical residential electricity rates. It expects 200–240 V AC.
Chip and hash-board architecture
The S19 Pro uses the 7nm BM1398. Each of the three hash boards carries 114 chips organised into 38 voltage domains — three chips per domain — with each domain regulated to about 0.32 V and the board boosted to roughly 12.2 V. The denser packing is the difference between the Pro and the base S19. Voltage is regulated per domain, not per individual chip, so a single failed chip takes down its whole domain (and usually the chain) — the first thing to check when diagnosing a dead board.
Cooling and noise
Two high-static-pressure fans cool the boards front-to-back. At around 75 dB the S19 Pro is loud and not suited to occupied living space. Keeping airflow clean and temperatures down is the single biggest lever on its lifespan.
Custom firmware on the Antminer S19 Pro
The S19 Pro is one of the most popular targets for third-party firmware. Custom firmware does not change the silicon — it changes how the control board drives it. The headline feature across the firmware ecosystem is autotuning: instead of running every chip at one factory frequency, the firmware finds an efficient operating point and applies it per voltage domain, not per individual chip. Because S19 Pro chips share regulated domains, frequency and voltage are tuned at the domain level, and the values are calculated live from each board’s measured behaviour rather than loaded as fixed presets.
Used carefully, autotuning lets an operator underclock for lower J/TH and heat, or push for more hashrate within the board’s limits; many firmware projects also support fleet-wide updates and low-power modes. This category exists because of the people who built it in the open — Braiins pioneered ASIC autotuning and the Stratum V2 protocol, and a broader community carried it forward. Our firmware comparison lays out the trade-offs honestly, including dev fees and what each project actually open-sources.
D-Central’s own contribution to that lineage is DCENT_OS, a GPL-3.0 open-source Antminer firmware we are building in the open. It is in closed beta today, with a public beta targeted for summer 2026 — experimental, not production-ready. You can join the DCENT_OS waitlist to follow or test it. We stand on the shoulders of the people who opened this space first.
Owning and repairing an S19 Pro
We have repaired and refurbished S19 Pro units on our Laval bench since the line launched. The BM1398 platform is mature and very serviceable — chip-level and domain-level board repair is routine, and parts are abundant. When a board drops a chain or a unit stops hashing, we publish transparent flat-rate ASIC repair pricing instead of the opaque return-for-repair loop the manufacturers run, and we will tell you honestly when an older S19 Pro is better repaired than replaced. Tested, warrantied refurbished units appear in our shop as they clear the bench.
FAQ
What is the Antminer S19 Pro’s hashrate and power consumption?
The Antminer S19 Pro produces about 110 TH/s while drawing roughly 3,250 W, for an efficiency of about 29.5 J/TH. A 105 TH/s bin also shipped.
What chip does the Antminer S19 Pro use?
The S19 Pro uses Bitmain’s 7nm BM1398 ASIC. Each of its three hash boards carries 114 chips arranged in 38 voltage domains (three chips per domain).
How is the S19 Pro different from the base S19?
Both use the same BM1398 chip, but the Pro packs three chips per voltage domain (114 per board) instead of two (76 per board). That denser layout is why the Pro reaches ~110 TH/s at ~29.5 J/TH versus the base S19’s ~95 TH/s at ~34 J/TH.
Can the Antminer S19 Pro run custom firmware?
Yes. The S19 Pro is one of the most popular firmware targets. Autotuning firmware adjusts frequency and voltage per voltage domain at runtime to trade hashrate for efficiency. D-Central is also building DCENT_OS, an open-source (GPL-3.0) firmware currently in closed beta.
Is the Antminer S19 Pro worth running in 2026?
At about 29.5 J/TH the S19 Pro is the most usable of the original S19 line, but it is still far less efficient than current S21-class miners. It makes sense on cheap power or as a heat source, and is marginal at typical residential rates.
