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one note on the der8auer video: he mentions that the power headroom on the 5090 is just 15%, due to the high power draw and only a single connector being used, and states his opinion that they should've gone for two connectors to offer more headroom.

I agree with this in general (15% cuts it too fine), but it's important to contextualise the problem here: assuming perfect sharing, two connectors would give you a headroom of 130%.

the magnitude of current imbalance within the cable is 350%.