Do note that Finsky being Finsky, no doubt the PCIe leads are 16ga and survived without even a blister. Then again, together 9x 16ga wires can carry a helluva lot of current. Connectors got toasted as aftermath of the main fault. What very obviously blew are the power planes on the PCB's.
He mentioned it was an s7 batch-1, those have no Vcore reg so the strings of chips are fed directly from the PSU with nothing at all to limit power going through the PCB other than the resistance of the copper itself. The first 3 batches of s9's are the same setup.
When a chip or something else shorted the power planes and with the board fed by a supply more than happy to dump in over 3x more than an entire 3-board miner normally takes
Been using the Bitmain PSU's for several years with zero problems other than the fan whines more after a couple years. While a similar fault when using a more reasonably rated supply would still toast a board the result should be far less catastrophic since the PSU would shut down a lot sooner.
Oh, and all computer PSU's and pretty much all industrial ones are switchers. Other than in legacy equipment from the 70's or for very special needs I haven't seen a high power linear supply in decades.
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ASIC-based btc hardware only here and we outgrew GPU's years ago.
Try posting altcoin questions in the altcoin areas...
