Which Blake2b Miner Should You Buy? All Six BTCB2 ASICs, Compared

Six Blake2b machines, and the price of a terahash across them runs from $171 to $682 — a four-fold spread for hardware that all does exactly the same job on exactly the same chain. On BTCB2 that single number decides your outcome more than hashrate, more than efficiency, and considerably more than the brand on the case.

This is the comparison we would want if we were buying. Every published specification for all six machines in our BTCB2 collection, the derived numbers that actually matter, and an honest verdict on each — including which ones we think are poor value at today's prices.

If you have not read what BTCB2 is and why these machines can mine it, start there. This article assumes you already know you want Blake2b hardware and are deciding which.

First, the stakes: you are buying terahash, not efficiency

On Bitcoin, hardware selection is an efficiency argument. Hashprice is low, electricity is the dominant cost, and a machine at 9.5 J/TH beats a machine at 23 J/TH because power is most of the bill.

BTCB2 currently inverts that. Electricity at a hosted rate runs between $0.83 and $2.91 per machine per day against gross revenue in the tens of dollars — a few percent. When power is a rounding error, the thing you are really buying is raw hashrate, and the sensible question becomes how many dollars a terahash costs you.

That is the whole selection logic, and it produces an uncomfortable ranking: the two cheapest machines in the catalogue are the two best buys, and the two most expensive are not. The payback arithmetic behind that claim is worked through in full separately.

The full specification table

Everything published for all six machines, sorted by price per terahash.

Note what the efficiency column does not do: it does not track price. The most efficient machine here, the BM-S3 at 163.2 J/TH, is 38% more efficient than the least efficient, and every one of these machines is roughly twenty-five times less efficient per terahash than a current Bitcoin miner. On this chain that is survivable. It will not always be.

Machine by machine

Ordered by price per terahash, best value first. The daily figure on each card is the gross revenue published on that machine's product page, read on 16 September 2026 — before electricity, and before the difficulty increases that will follow.

Goldshell SC5 Pro II — the value pick

$61.77 / day 14 TH/s 3,300 W $171 / TH 55 dB

14 TH/s for $2,399 is the cheapest terahash on the page by a clear margin, and at 55 dB it is among the quietest units here despite drawing 3,300 W. It is the largest machine physically (370×305×450 mm, 13.1 kg) and the least efficient of the Goldshells at 235.7 J/TH, neither of which costs you much while power is a few percent of revenue.

Shop the Goldshell SC5 Pro II →

Goldshell SC5 Pro — the cheapest way in

$48.50 / day 11 TH/s 2,820 W $185 / TH 55 dB

$2,039 is the lowest entry price in the collection, at $185/TH and 2,820 W — the lowest draw of any full-size unit here, which matters if your circuit is the constraint. Practically identical to the Pro II in form and noise, with three terahash less.

Shop the Goldshell SC5 Pro →

iBeLink BM-S1 Max — the compact veteran

$53.51 / day 12 TH/s 3,150 W $383 / TH 75 dB

Released in 2022, 12 TH/s at 262.5 J/TH — the least efficient unit here — but the lightest at 9 kg and unusually narrow at 128 mm, so it racks densely. At $383/TH it sits mid-table on value. The efficiency is what would worry us first if revenue per terahash fell hard.

Shop the iBeLink BM-S1 Max →

Goldshell SC6 SE — middle of everything

$74.93 / day 17 TH/s 3,330 W $412 / TH 80 dB

17 TH/s at 195.9 J/TH is the second-best efficiency here, but $6,999 puts it at $412/TH with the highest power draw (3,330 W) and the loudest fans (80 dB) in the collection. It is a facility machine, not a home machine.

Shop the Goldshell SC6 SE →

iBeLink BM-S3 — the best machine, at a price

$107.44 / day 19 TH/s 3,100 W $421 / TH 163.2 J/TH

19 TH/s and 163.2 J/TH make this the most capable and most efficient unit in the group, in a compact 340×190×293 mm chassis. At $421/TH you pay roughly two and a half times the SC5 Pro II's rate for that. Buy it when hashrate density is the constraint — limited rack slots, limited shipping, or a plan to keep mining after revenue normalises and efficiency starts deciding things.

Shop the iBeLink BM-S3 →

Goldshell SC Lite — the one you can actually run at home

$19.68 / day 4.4 TH/s 950 W $682 / TH C13 plug

4.4 TH/s, 950 W, 55 dB, and a common C13 connector on 110–240 V. That last detail is the whole point: it is the only machine here that plugs into an ordinary domestic outlet in North America without a dedicated circuit. $682/TH is expensive hashrate, and you are buying convenience and legality-at-home rather than throughput.

Shop the Goldshell SC Lite →

Home or hosted?

Five of these six machines need a 200–240 V supply on a C19 connector, draw around 3 kW continuously, and make between 55 and 80 dB of noise. That is a workshop, a garage or a facility — not a spare bedroom.

The other consideration is the tariff. A 3.3 kW machine consumes 28,908 kWh a year, and what that costs depends entirely on where the machine sits.

All of these machines can be hosted with us from day one, at published rates for every site and tier, with a 95% guaranteed minimum uptime, compensation when we miss it, all management services included in the rate, and remote access to each machine from the dashboard. And because you own the hardware outright, moving it later is your decision, not ours.

What we would buy

The case for the cheap machines is that on a chain this young, capital recovery speed is risk management. The case for the BM-S3 is the opposite argument on a longer horizon: when revenue per terahash eventually falls, 163.2 J/TH keeps running in conditions where 262.5 J/TH does not.

The case against buying two of anything before you have watched one run for a month is the strongest case on this page.

Final thoughts

Comparison articles usually end by crowning the fastest machine. That would be the BM-S3, and it would be the wrong advice for most people reading this, because the fastest machine and the best-value machine are not the same thing and on BTCB2 they are not even close.

Work out what your constraint actually is — capital, rack space, circuit capacity, noise tolerance, or how long you intend to keep mining — and the table above answers it. Then check the live figures, because a five-week-old chain reprices faster than any article can.

The machines are real, they are yours, and they will outlive this particular window. Buy on the number you can still defend if revenue halves.