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Machine review · Oct 26, 2026 · 5 min read

Antminer S19 XP review: 21.35 J/TH on air, a low box price, and Nigeria is where it pays

Bitmain's air-cooled S19 XP makes 141 TH/s from 3,010 W and sells at a low price per terahash. Its case is a cheap box on cheap power: it has stayed above Nigeria's power line every day since the 2024 halving, and above Argentina's on all but about seven weeks of 2026.

Firsthand card: "Antminer S19 XP review: 21.35 J/TH on air, a low box price, and Nigeria is where it pays", with the store photograph of the Antminer S19 XP, 21.35 J/TH, 141 TH/s, air-cooled

Bitmain Antminer S19 XP (141 TH/s)

The bottom line

The S19 XP is Bitmain's air-cooled 141 TH/s machine: 3,010 W, 21.35 J/TH. In Argentina, at 6¢, it makes a bitcoin for about $71,900 of electricity and returns roughly 13% in its first year at today's price. At Nigeria's 3.9¢ the coin costs about $46,700 and year one is 39%.

Bought once its price settled, in January 2024, it has mined and kept 0.0853 BTC for $3,898 of power: $2,994 of cashflow against a $3,548 landed cost, 84% of the box in 979 days. It spent 763 days in Argentina and crossed to Nigeria on 25 March 2026. Between now and the 2028 halving it has another 0.025 BTC in it, worth about $3,144 with bitcoin back at its previous high of $124,493.

What you are buying is a low price per terahash on air: $3.36 today, against $7.67 for the S21 Pro and $11.55 for the S21 XP. What you pay for it is electricity. The case is the cheap box and cheap power, not the efficiency.

Scores

CriterionScoreWhy
Cashflow4/10Makes a bitcoin for about $71,900 of electricity at 6¢ and about $46,700 at 3.9¢, and returns roughly 13% in year one in Argentina and 39% in Nigeria. It has covered 84% of its hardware so far. The S21 XP returns about 31% in Argentina.
Longevity3/10At 21.35 J/TH its line is $30.74 a petahash a day at 6¢ and $19.98 at 3.9¢. Half of 25 October's hashprice, $18.14, is under both, so after the halving it needs power at or below about 3.5¢.
Efficiency3/1021.35 J/TH against 13.5 for the S21 XP and 15 for the S21 Pro, behind every S21-generation air machine we stock.
Quality control4.5/10Scored low and as unknown. A host flagged the generation's hashboard design in 2023, and we found no operator report or failure rate for the S19 XP itself that we could cite.
Serviceability6/10Parts-only repairs on site in Argentina, and a repair trade that publishes maintenance guides for the model. No manufacturer warranty centre next to the site, as in the UAE.

Cashflow and efficiency count most, because they decide how many halvings a machine clears. Reliability is scored low and marked unknown, so it holds the total down.

Buy it if

Walk away if

Bitmain's first 5 nm Antminer, still on air at 21.35 J/TH

Bitmain unveiled the S19 XP in November 2021. ForkLog reported on 8 November 2021 that it was built on TSMC's 5 nm process and rated 140 TH/s at 21.5 J/TH from 3,010 W, with shipments expected from July to September 2022.

The bin we list is 141 TH/s from 3,010 W, 21.35 J/TH, air-cooled, 400 × 195 × 290 mm, 75 dB, on 200 to 240 V with an operating range of 0 to 40 °C. A repair shop's spec guide gives the same power, voltage and noise, and names the chip as the BM1366. Bitmain's own product page could not be opened, so these specs are our store record checked against those two sources, and we leave out the weight, where they disagree.

It is the efficiency of the S19j XP at 21.5 J/TH, and well behind the S21 XP at 13.5. What this machine did through the 2024 halving is in its look-back.

Chart: Coins kept since the first settled price we hold for it, the electricity that made them, and where it lands by the 2028 halving.

A box that sells at a low price per terahash

The 141 TH/s unit is $474 today, $3.36 a terahash. The first price we hold for it, on 14 August 2023, was $22.68 a terahash. The lowest we hold is $3.15 a terahash, on 6 February 2026, so today's price is within about 7% of the best entry price it has had. The hashrate is the same as it was in 2023.

A purchase once the price settled, in January 2024, cost $2,398, and $3,548 landed at our Argentina site once freight, duty, customs and setup were added. Beside the air-cooled Bitmain machines it competes with it is the cheapest per terahash: the S19j XP is $3.57, the S21 Pro $7.67 and the S21 XP $11.55. The guide to what a miner costs all-in shows what sits on top of the box before it is running.

Chart: What the 141 TH/s unit has cost, from the first price we hold for it in August 2023.

What a coin costs it, and what year one returns

In Argentina, at 6¢, the S19 XP makes a bitcoin for about $71,900 of electricity today, against a bitcoin price of $79,691. At Nigeria's 3.9¢, with Nigeria's lower uptime already counted, the same coin costs about $46,700. The S21 Pro makes one in Argentina for about $50,500 and the S21 XP for about $45,400.

In its first year the S19 XP returns about 13% in Argentina and 39% in Nigeria at today's price and difficulty. The S21 Pro returns 35% in Argentina and 42% in Nigeria, the S21 XP 31% and 34%. The gap between this machine's two figures is the point: at 21.35 J/TH it is built for cheap power, and a cheap box does most of the work when power is cheap.

A machine starts at its home site and crosses once, when a year of figures says so. The one in our run crossed after 763 days, on 25 March 2026. Over its run since January 2024, electricity has averaged about $45,700 a coin: a lifetime figure, mostly at 6¢ before the move, and not the one to plan on. The figure to plan on is today's.

Chart: What a coin costs it in electricity against bitcoin's price. The gap between the lines is the cashflow.

Where the halving puts it

A machine's line is the hashprice at which it stops covering its own power. At 21.35 J/TH a petahash uses 512 kWh a day: $30.74 at 6¢ and $19.98 at Nigeria's 3.9¢. Network hashprice was $36.27 per petahash per day on 25 October on our hashprice chart, so the S19 XP clears the 6¢ line by $5.53 and Nigeria's by $16.29. In a day, a 141 TH/s machine earns about $5.11 at that hashprice and spends $4.33 on power at 6¢, or $2.82 at 3.9¢, before uptime. The most it can pay for power and still clear today is about 7.1¢ a kilowatt-hour.

The 6¢ line has been crossed. Since the April 2024 halving, hashprice has been under $30.74 on 51 of 920 days, all of them in 2026: 10 in February, 11 in March, 2 in April, 17 in June and 11 in July. The low was $27.74 on 6 June 2026, $3.00 under the line. On no day has it been under Nigeria's $19.98.

The 2028 halving halves the coins a petahash earns. At today's price and difficulty that puts hashprice near $18.14, under the 6¢ line and $1.85 under Nigeria's. At that hashprice the machine clears power at rates up to about 3.5¢. That is today's conditions held flat, not a forecast: it is why every projection we publish assumes the old high returns, and the forward figures here do the same. The S19 XP is a machine for the run to April 2028, and after it a machine for power at or below about 3.5¢, or for a hashprice above today's.

The guide to efficiency and halvings shows where the line sits at every J/TH, and the guide to crossing once explains why the move to Nigeria is made one time.

Chart: Network hashprice per petahash per day. The S19 XP needs about $31 of it at 6¢ and about $20 at 3.9¢; the dip under the first line is June. Open the chart

What a fault costs you here

The S19 XP's reliability question is a design one. In March 2023, Compass Mining, a hosting company, told its customers that Bitmain's newer S19 and S19 XP units had lost the peripheral interface controller on the ASICs, which makes individual hashboards harder to control, and used aluminium plating on the side. Compass wrote: "We view the design decision to swap to aluminum-plating on hashboards as a net negative". It also said third-party firmware can address the controller issue, and urged miners to "double down on their repair game".

That is one host's view, more than three years old, and we found no operator thread or failure rate for the S19 XP that we could stand behind. The repair shop's own maintenance guide says the boards reward careful handling and clean power. We score quality control low and mark it as unknown.

What a fault costs is the part that matters here. In Argentina we repair on site and bill the cost of the parts only; it is a line item, not a catastrophe. It is also an air-cooled unit at 75 dB, so it belongs in a hall with proper airflow, which the guide to air, hydro and immersion explains.

Bitmain changed the hashboard design on this generation, a host said so in 2023, and we found no failure rate to put against it. We score that low, not as good.

Chart: Scored on what costs an owner money over a four-year life. Reliability is scored low and marked unknown.

Our two cents

The S19 XP is a sound way into air-cooled hashrate for a small cheque. At Nigeria's 3.9¢ it clears its power today by a wide margin. At 6¢ it clears today and leans on bitcoin recovering afterwards, and it has already sat under that line for weeks in 2026.

A buyer who wants the cheapest coin should look up: the S21 XP makes one in Argentina for about $45,400 against about $71,900 here, at a first-year return of 31%. The figure below ranks what beats this machine on cost per coin and then on year-one return, in stock today. A coin that costs less to make is a coin you keep more of.

What beats it on cost per coin and on first-year return, in stock today.

What people are saying online

We view the design decision to swap to aluminum-plating on hashboards as a net negative

A hosting company's view of the hashboard change that came with the S19 XP generation.

Sources and further reading

Which machines this covers

The other side of this machine

The Antminer S19 XP mined through the whole 2024 halving before it ever left Argentina — Bitmain's first 5-nanometre miner shipped into the worst ASIC market on record, on the strength of a chip nobody had put in a bitcoin machine before. Ours spent more than two years at one site, rode the subsidy cut straight through, and only crossed to cheap power once the numbers stopped being close.

Disclosure

Firsthand Bitcoin sells and hosts mining hardware, including this machine. No manufacturer, distributor or affiliate programme paid for or reviewed this page and we take no commission on the links above. Historical figures are computed from daily bitcoin price and network hashprice, each day valued at its own prices. Nothing here is investment advice.