Antminer S19 Hydro Tuning

The honest answer to “S19 Hydro underclock settings”: set a watt target at the mode floor — 1,100 W in Normal mode (20.8 J/TH) or 1,300 W in Low Power (19.1 J/TH, the set’s best). That 1,100 W floor fits a 120 V circuit budget on paper, but hydro cooling loops are a facility decision, not a plug-in option; the envelope below is presented with that caveat up front.

Quick answer

The Antminer S19 Hydro tunes across a 2,700–9,500 W envelope (Performance mode: 89–218 TH/s). Best catalog efficiency is 29.0 J/TH, and the sweet spot — everything within 5% of it — spans 2,700–4,560 W. The floor is 1,100 W — 20% of the 5,451 W factory rating. There are no frequency/voltage settings to copy: you set a watt target and the firmware autotuner derives the rest for your unit. Status: Verified (extraction).

Best efficiency sits at or near the envelope floor: the lowest watt target your hashrate goal tolerates is also the most efficient point in the catalog.

Antminer S19 Hydro — Performance mode Verified (extraction)

2,700 W – 9,500 Wwatt envelope

89 TH/s – 218 TH/shashrate span

29.0 J/THbest efficiency @ 4,560 W

2,700 W – 4,560 Wsweet spot (≤5% off best)

Risingcurve shape

11catalog points

Floor exceeds both 120 V budgets (1,440 / 1,920 W) — this is 200–240 V territory. Budgets are the NEC 80% continuous-load rule; circuit fit only — stock Bitmain APW-series PSUs require 200–240 V input, so any 120 V build needs a PSU change regardless of watt target. At the floor this mode dissipates about 9,212 BTU/h (watts × 3.412).

Antminer S19 Hydro — Normal mode Verified (extraction)

1,100 W – 4,690 Wwatt envelope

53 TH/s – 124 TH/shashrate span

20.8 J/THbest efficiency @ 1,100 W

1,100 W – 1,100 Wsweet spot (≤5% off best)

Risingcurve shape

8catalog points

Floor fits a 120 V 15 A continuous-load budget (1,440 W). Budgets are the NEC 80% continuous-load rule; circuit fit only — stock Bitmain APW-series PSUs require 200–240 V input, so any 120 V build needs a PSU change regardless of watt target. At the floor this mode dissipates about 3,753 BTU/h (watts × 3.412).

Antminer S19 Hydro — Low Power mode Verified (extraction)

1,300 W – 3,640 Wwatt envelope

68 TH/s – 110 TH/shashrate span

19.1 J/THbest efficiency @ 1,300 W

1,300 W – 1,300 Wsweet spot (≤5% off best)

Risingcurve shape

8catalog points

Source: Firmware-extraction set, three cooling/tuning modes. Hydro plumbing is a facility decision — the low floors here do not make hydro a plug-in home option.

How to set a power target on this model

Aftermarket firmware exposes underclocking as a power target (sometimes "power limit" or a preset picker), not as frequency/voltage fields. Pick a watt figure inside the envelope above; the autotuner benchmarks your boards and settles onto it over a tuning period. Braiins OS+, VNish and LuxOS each expose this in their own UI, and DCENT_OS uses watt-target autotuning on its supported models; the undervolting guide walks through the firmware side step by step, and the firmware comparison covers which firmware supports which model. Verify the result at the wall with a meter — the target is an input, the wall draw is the fact.

Frequency and voltage are calculated at runtime by the firmware autotuner — never fixed presets; per-unit silicon quality, ambient temperature and cooling shift real results.

These envelopes are derived aggregates (bounds, bands, counts) — the row-level operating points, the interactive picker and the CSV/JSON of the source data live in the ASIC Power Profiles Database, the single source dataset for every number on this page.

Antminer S19 Hydro full specifications → · Row-level operating points (source dataset) → · Overclock headroom by cooling → · All tuning envelopes →

Related products, repair, and setup paths

Last reviewed August 13, 2026.