iBeLink BM-S1 6.8 TH/s Blake2B Siacoin Miner

Two figures rather than one, because this machine has two modes. At full power it delivers 6.8 TH/s of Blake2B-Sia hashing on 2,350W, which is 346 J/TH. In ECO mode it runs 4.3 TH/s on 1,050W, which is roughly 244 J/TH. Both ratings carry about 5 percent tolerance. The second set of numbers is the more interesting one, since ECO mode is 29 percent more efficient per terahash than the same machine at full tilt while drawing less than half the electricity. iBeLink released the BM-S1 in March 2022 and it remains the smallest and lowest draw model in their Siacoin line.

ECO mode is a lower power operating setting that trades hashrate for efficiency: 4.3 TH/s on 1,050W instead of 6.8 TH/s on 2,350W. The trade is favourable, because you give up 37 percent of the output but save 55 percent of the power, which is why efficiency improves from 346 J/TH to around 244. For most buyers the answer is yes, use it. If the reason you chose this machine over a BM-S3 or BM-S3+ was its low electrical draw, running it flat out gives you the worst of both worlds: still not enough hashrate to compete on scale, and worse efficiency than the alternatives. ECO mode also brings the draw to around 4.6 amps at 230V, which is what makes the machine fit circuits that cannot take a larger miner.

It is the smallest and the least efficient at full power. The line runs BM-S1 at 6.8 TH/s and 346 J/TH, BM-S1 Max at 12 TH/s and 263 J/TH, BM-S3 at 19 TH/s and 163 J/TH, and BM-S3+ at 25 TH/s and 136 J/TH. Against the BM-S3+ specifically, the BM-S1 produces 27 percent of the hashrate while using about two and a half times the energy for each terahash it does produce. In ECO mode the comparison improves considerably, with 244 J/TH placing it ahead of the BM-S1 Max, but it is still an entry machine rather than a scaling one. What it uniquely offers within the range is the lowest power draw, the smallest and lightest chassis, and a genuine low power mode that none of the others have.

For most buyers, no, and that is worth saying directly. If you are building Siacoin capacity on ordinary electricity prices, the newer models in the range will out-earn this one by enough that the difference in purchase price stops mattering fairly quickly. It has to cost less than 27 percent of a BM-S3+ merely to match on hashrate purchased per unit of money, and the running cost gap works against it every hour after that. Three situations do justify it: a circuit with limited headroom, where a 1,050W ECO mode machine fits and a 3.4 kW one does not; very cheap or otherwise wasted power, where the efficiency penalty stops dominating; and a first, deliberately small position in Blake2B mining while you learn how the network behaves. Outside those, buy further up the range.

Because J/TH only compares between machines running the same algorithm. A current Bitcoin ASIC quotes around 13 J/TH, but it is doing completely different computational work against a different difficulty scale, so the numbers are not commensurable and setting them side by side tells you nothing. Every Blake2B machine reads badly against Bitcoin hardware. What matters is the ranking inside the algorithm, and there the BM-S1 at full power sits at the bottom of the current field, with the BM-S3+ at 136 J/TH, the BM-S3 at 163, Goldshell's SC6-SE near 194, the SC5 Pro II near 236, the SC5 Pro near 256 and the BM-S1 Max near 263. In ECO mode at roughly 244 J/TH the BM-S1 moves into the middle of that group.

Our listing shows 220V, and at full power the machine draws 2,350W, which is around 10.2 amps at 230V. In ECO mode that falls to 1,050W, roughly 4.6 amps, which is the number that makes this model practical on constrained circuits. It needs its own circuit rather than a shared socket, and no three phase supply or industrial distribution is involved. Voltage information for this model is poorly reported across the market, with some listings showing a bare 12V that appears to describe an internal DC rail rather than the input, so confirm the acceptable input range with us at order rather than relying on a third party listing. As with any multi unit build, size the panel on what the first delivered machines actually draw rather than on the plate rating.

75 dB at full power, which is industrial noise regardless of the machine's modest size, and ECO mode reduces both fan speed and noise. At 2,350W it sheds roughly 8,000 BTU per hour, or about 3,600 in ECO mode. None of that belongs in a living space. A plant room, a ventilated garage or outbuilding, or a hosted rack are the realistic homes. The compact 9 kg case makes it easier to site than its siblings, but the airflow rules are unchanged: cool air must reach the intake freely and hot air must leave without circling back round to the front, because recirculation is what quietly throttles small installations and shortens hardware life.

Siacoin, and effectively nothing else, because Blake2B-Sia is a Sia specific implementation. That is a narrower commitment than a SHA-256 machine, which can be redirected between Bitcoin, Bitcoin Cash and various smaller chains as economics shift. Here there is no second option, so the hardware and the network position are the same decision. It is also worth knowing that Sia has previously amended its protocol in ways that left certain ASICs outside the mainline chain, and the Innosilicon S11 SiaMaster is filed by mining databases today against SiaClassic and SpaceCash rather than Siacoin proper as a result. That is record rather than prediction, and current hardware from established suppliers sits differently than the 2018 machines did, but it makes compatibility with the network as it now runs a fair question to ask in writing before a sizeable order.

That turns on the Siacoin price, network difficulty and your electricity rate, and no fixed daily figure survives contact with a small cap network for long. At 2,350W, or 1,050W in ECO mode, your tariff is the input you control, and it matters more here than on the newer models because this machine converts less of each kilowatt into hashrate. Because Blake2B hardware cannot be pointed at another coin, there is no hedge inside the machine either. Model several Siacoin price scenarios rather than one, put your actual rate through the live calculator, and be honest about whether the efficiency gap against a BM-S3 or BM-S3+ is one your electricity price can absorb.

Ordinary air cooled housekeeping: clean fans and heatsinks on a schedule rather than after a fault, check connectors periodically, and expect fans to be the first wear item over a long run. Distributors typically publish a six month iBeLink factory warranty and a PSU included in the box, though both vary by channel and batch, so confirm at order; iBeLink also builds in smaller runs than Bitmain, which means a thinner independent parts and repair market and availability that tightens quickly when Siacoin draws attention. Hosting is worth quoting alongside the hardware, since our managed US sites already run the supply and ventilation this class needs and electricity is the dominant running cost. Treat any published availability date as indicative and confirm current stock and batch timing through the quote.