Antminer S19 Specs: Maximize Your Mining

The Antminer S19 is the model that defined Bitmain’s 2020 generation: a SHA-256 ASIC miner built on the 7nm BM1398 chip, delivering roughly 95 TH/s at about 3,250 W for an efficiency near 34.2 J/TH. It is no longer a frontier machine — the S21 generation is far more efficient — but the S19 remains one of the most widely deployed, well-understood, and repairable Antminers in the field, which is exactly why it is still worth knowing in detail. This guide covers the real specifications and internals, written from D-Central’s bench experience repairing these units since they shipped.

Antminer S19 specifications, explained

Hash rate

The standard S19 produces about 95 TH/s of SHA-256 hashing. Hashrate is the count of hash attempts per second the unit can make; more of it means a proportionally larger share of network rewards. The 95 TH/s figure is the factory point — like every Antminer, real output drifts a little with chip temperature, firmware, and the health of all three hash boards.

Power and efficiency

At roughly 3,250 W wall draw, the S19’s efficiency lands near 34.2 J/TH (joules per terahash). Lower is better, and by 2026 standards 34 J/TH is high — the S21 generation runs at 15–17.5 J/TH. For owners, that means an S19 only makes sense on genuinely cheap or free/curtailed power, or as a heat source. The unit expects 200–240 V AC; it is not a 120 V machine in stock form.

Chip and hash-board architecture

The S19 uses Bitmain’s 7nm BM1398. Each of the three hash boards carries 76 chips organised into 38 voltage domains — two chips per domain — with each domain regulated to about 0.36 V and the board boosted to roughly 13.7 V. This per-domain power structure matters: voltage is regulated per domain, not per individual chip, and when a single chip in a domain fails the whole domain (and often the chain) goes dark. It is the single most important fact for diagnosing a dead board, and the reason "per-chip voltage control" is a myth worth retiring.

Cooling and noise

Two high-static-pressure fans pull air front-to-back across finned heatsinks. At around 75 dB the S19 is loud — industrial-shed or detached-garage territory rather than a living room. Clean filters and unobstructed airflow are the cheapest way to keep an S19 alive; thermal stress is the leading cause of the chip and domain failures above.

Custom firmware on the Antminer S19

The S19, like most SHA-256 Antminers of its generation, is a common target for third-party firmware. Custom firmware does not change the silicon — it changes how the control board drives it. The headline feature across the modern firmware ecosystem is autotuning: rather than running every chip at one factory frequency, the firmware searches for an efficient operating point and applies it per voltage domain, not per individual chip. Because chips on an S19 board share a regulated domain, frequency and voltage are tuned at the domain level, and the values are calculated live from each board’s measured behaviour — they are not fixed presets baked into the image.

Used carefully, autotuning lets an operator trade hashrate for efficiency (underclock to shave J/TH and heat) or push for more hashrate within the board’s thermal and electrical headroom. This whole 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 of firmware and tooling authors carried it forward. If you are weighing options, our firmware comparison lays out the real trade-offs — dev fees, features, 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. If you want to follow it or test early, you can join the DCENT_OS waitlist. We stand on the shoulders of the people who opened this space first, and we say so plainly.

Owning and repairing an S19

We have repaired and refurbished S19-family Antminers on our Laval bench since they launched, so this page reflects what an S19 is actually like to keep running. The good news is that 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. Tested, warrantied refurbished units also appear in our shop as they come through the bench. We build to order and stock lean — quality over warehouse — so availability varies, and we will tell you honestly when an older S19 is better repaired than replaced.

FAQ

What is the Antminer S19’s hashrate and power consumption?

The standard Antminer S19 produces about 95 TH/s while drawing roughly 3,250 W, giving an efficiency of about 34.2 J/TH.

What chip does the Antminer S19 use?

The S19 uses Bitmain’s 7nm BM1398 ASIC. Each of its three hash boards carries 76 chips arranged in 38 voltage domains (two chips per domain).

Is the Antminer S19 still worth running in 2026?

At about 34 J/TH the S19 is far less efficient than current S21-class miners, so it generally only makes economic sense on very cheap, free, or curtailed power, or when its heat is being used. It remains popular because it is reliable, abundant, and easy to repair.

Can the Antminer S19 run custom firmware?

Yes. The S19 is a common target for third-party firmware. 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.

Does the Antminer S19 run on 120 V?

No. In stock form the S19 expects 200–240 V AC. Running it at home on standard North American power requires a 240 V circuit or a modified low-power configuration.