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so to be clear the problem here is 100% the GPU and nvidia being fucking idiots.

you've got 500W going through this cable at 12V. so that's 40A.

the cable has a bunch of 12V lines and a bunch of GND lines. if the current is shared across those lines, it's all good. they're well within spec.

but what happens is if you put them all in parallel, whichever cable has a slightly lower resistance will carry more current, resulting in most of the current going down one or two wires and getting hot.