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: These machines typically ran 24/7 in industrial farms before being resold. Common issues include dead hash boards , failing cooling fans, and high noise levels (roughly 76–85 dB, which is comparable to a loud vacuum cleaner).

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: The primary advantage of buying through Amazon is the 30-day return policy . This offers a layer of protection that direct-from-China or private-party sellers often do not provide, allowing you to return the unit if it arrives with faulty components. 3. Financial Reality in 2026 From a purely economic standpoint, the is largely obsolete for profit as of 2026. Profitability : An