Used Goldshell BLAKE2b Miners: CAEU04, CAEU14, ARI31 and SC ULTRA

1Which Used BLAKE2b Miner Fits Your Plan?

Goldshell CAEU04, CAEU14, ARI31 and SC ULTRA are listed as used BLAKE2b-Sia ASIC miners for Siacoin. Their normal-mode output ranges from 11.8 to 24 TH/s, with energy-saving profiles that reduce both hashrate and power. They are specialized machines, not Bitcoin SHA-256d miners.

The emerging BLAKE2b fork gives buyers another compatibility question to investigate, but does not establish a new guaranteed income stream. Start with the exact machine, accepted work, wall power and purchase terms. Then evaluate any alternative network separately.

This comparison covers second-hand configurations. For the SC Lite and SC5 range, see our Goldshell Siacoin model comparison; its older fork commentary predates the September developments below.

2BLAKE2b: Hash Function, Mining Work and Siacoin

BLAKE2b is a cryptographic hash function, not a coin. RFC 7693 describes a design optimized for 64-bit platforms, with configurable output lengths up to 64 bytes. In proof-of-work mining, hardware repeatedly hashes candidate work until it finds an output below the required target.

That general definition does not make every BLAKE2b application interchangeable. Digest parameters, input layout, nonce handling and the protocol used to deliver work all matter. The label BLAKE2b-Sia identifies these listings with the Sia mining workload. It does not certify every blockchain using the same hash family.

Sia is a decentralized storage network: renter software encrypts files before distributing data across hosts, and Siacoin funds network activity. Mining secures transactions; owning a miner does not itself provide storage. Storage demand is useful context, not a promise that SC price or mining revenue will rise.

Sia documents a continuing miner subsidy of 30,000 SC per block, rather than Bitcoin-style repeated halvings toward zero. A separate Foundation subsidy also affects issuance. The June 2025 v2 hard fork required compatible network software; pool and wallet software must remain current even when the ASIC itself is unchanged.

3The BLAKE2b Fork: What Changed by September 4?

The BIP-110-associated minority chain moved away from SHA-256d. Released Knots code fixes BLAKE2b activation at height 961,640, identifying 961,639 as the final SHA-256d block. Independent node tracking dates the first BLAKE2b block to August 30, 2026 and reports subsequent block production and difficulty adjustments.

The release documents BLAKE2b proof-of-work, extended block-header fields, an opt-in signature format and a temporary 800 kWU block-weight limit. These are protocol changes, not a simple pool-address substitution. This guide treats the resulting network as a separate minority fork, not an upgrade to the dominant SHA-256d Bitcoin network.

Historical miner signaling percentages, including the previously reported 2.53%, are not measurements of this new network's support. BLAKE2b and SHA-256d hashrates cannot be directly equated. Knots node counts likewise do not measure miner participation or economic adoption.

A BTCB2/USDC market page exists on Neoxa Exchange. A listing or displayed quote alone does not establish usable market depth, reliable withdrawals or broad wallet support. Check executable liquidity before assigning any resale value to rewards. The BLAKE2 project's hash-function documentation is not an endorsement of this fork or these machines.

4Four Goldshell Models Compared

Values below come from the current ZC MINER listings. Efficiency is calculated as watts divided by TH/s, rounded to the nearest J/TH. These are listed profiles, not our laboratory measurements; used-unit condition and firmware can change actual results.

ARI31 has the lowest listed normal-mode J/TH. SC ULTRA has the lowest Eco-mode J/TH, but ARI31 Eco uses the least absolute power. CAEU14 Eco delivers more hashrate than CAEU04 Eco while using less power. Purchase price, condition and site capacity still decide which trade-off makes sense.

5Explore the Four Used BLAKE2b Miners

Prices checked September 24, 2026 in USD. Product pages control current pricing, stock and order terms. Request a written quote where no positive selling price is published; shipping and applicable charges may be additional.

Used · Lower listed purchase price

Goldshell CAEU04

A price-led option for buyers who can support its running cost. Its Eco profile reduces load, but remains less efficient on paper than the other three Eco profiles. Compare the initial saving with your expected operating hours.

11.8 TH/s3,150 W9.5 TH/s / 2,400 W Eco

Listed price / Sep 24, 2026US$1,300

View Price & Availability

Used · Balanced Eco profile

Goldshell CAEU14

Its energy-saving profile offers a useful middle ground between output and power. Confirm that the supplied controller exposes both listed modes and that each board remains stable after a sustained warm-up.

14 TH/s3,400 W10.4 TH/s / 2,200 W Eco

Listed price / Sep 24, 2026US$1,600

View Price & Availability

Used · Lowest normal-mode J/TH

Goldshell ARI31

The strongest listed normal-mode efficiency in this group, with the lowest absolute Eco power. The large drop in hashrate between modes makes actual revenue per kWh more informative than headline output alone.

15.8 TH/s3,450 W9.7 TH/s / 2,060 W Eco

Listed price / Sep 24, 2026US$1,850

View Price & Availability

Used · Highest listed output

Goldshell SC ULTRA

Designed around a larger power budget in normal mode. Eco cuts the listed load substantially while retaining 15 TH/s. Evaluate the complete installation, cooling and used-unit condition before paying for the extra capacity.

24 TH/s5,780 W15 TH/s / 3,100 W Eco

Listed price / Sep 24, 2026US$2,250

View Price & Availability

Catalogue images identify the advertised product family, not the condition of the particular used unit you will receive. Request serial-specific photographs and test records before payment.

6Electricity Cost and Site Requirements

Calculate daily energy as watts ÷ 1,000 × 24. At an illustrative $0.10/kWh, continuous operation produces the following miner-only costs. These are expense calculations, not profit forecasts.

SC ULTRA's normal profile consumes about 4,162 kWh over 30 days before ventilation. Even the lowest-power Eco profile here is 2.06 kW. None should be approached as a casual desk appliance.

Have a qualified electrician verify the actual PSU label, supply voltage, connectors, circuit capacity and continuous-load requirements. Plan exhaust removal and replacement air; almost all electrical input becomes heat. Do not assume Eco mode makes an unsuitable installation safe.

Use measured wall power, pool fees, cooling, downtime and repairs in your operating model. Compare each mode's accepted revenue after costs, not just its lower J/TH. Our mining electricity cost guide explains the calculation framework.

7Verify Compatibility and Used-Unit Condition

The experimental DATUM BLAKE2b gateway publishes results for HS-Box, SC5 Pro, SC Box II, Antminer A3 and Innosilicon S11. Its matrix includes accepted shares and some block results, with model-specific limitations. It does not list CAEU04, CAEU14, ARI31 or SC ULTRA by these exact identifiers.

Successful tests on another Goldshell model are useful evidence, not certification of these four configurations. The cited gateway documents solo operation; its limitations should not be generalized to every independent pool. Connecting successfully is also weaker evidence than sustained accepted work, confirmed blocks and an understood payout path.

1. Identify the unit. Match the chassis label, serial, controller and firmware to the invoice. Do not infer specifications from a similar enclosure.
2. Inspect the hardware. Request photographs of boards, fans, PSU connections and any corrosion or repair history. Confirm included equipment and return terms.
3. Establish a Siacoin baseline. Obtain a sustained test showing all boards, temperatures, measured power, accepted shares and errors in both advertised modes.
4. Validate fork work separately. Record the node release, gateway or pool version, exact firmware, chain identity and rejection reasons. Confirm where rewards are paid.
5. Protect the network. Reset credentials, isolate management access, and use verified firmware sources. Read the ASIC firmware security checklist.

8BLAKE2b Miner FAQ