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The last replacement OEM PSU died, a total of 8 replacement Canaan 3S PSU has not failed, I like all my Canaan production and truly like the 3S but the OMG PSU are just junk, i purchased 6 Canaan 3S’s all 6 PSU failed within 3-4 months, purchased 6 replacement OEM PSU’s any they all failed as well, i then purchased 2 OEM replacement again 3rd time , and used rando USB PSU they hard and miner works in ECO mode on random USB PSU, however the two units i kept for myself i found 140w HKY PSU’s that fully supports the Canaan 3S and so far been 3x more reliable.