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and this is a 100% known problem. and it's solved using active current balancing on the GPU side. you put shunt resistors in series with the lines, measure the current, and actively shift the current draw in realtime to keep everything balanced. (you can do this with an ideal diode-OR controller, or separating the high-side feeds to separate sets of VRM phases)

nVidia *has* done this on some prior cards. but they reduced the shunt count here, running stuff in parallel, and this is the result.