Seems like 20v might be a better choice. Then you have 20v available for USB-C monitor ports. You could give every device its own modular swappable mini PSU th

Seems like 20v might be a better choice. Then you have 20v available for USB-C monitor ports. You could give every device its own modular swappable mini PSU that takes 20v and gives whatever the card requests, so if the onboad converters go bad on a GPU you can swap them. At least it seems like negative voltages are mostly on the way out!