We’re in total hypotheticals here, who knows how anyone will act… but…
If the 50 series GPU uses a H++ connector and you plug in a native 12 volt cable into a H+ PSU socket… if there is an issue they might turn around and say that you knowingly made and took a risk on a mismatch. On one hand, this would seem ridiculous because everyone is saying these cables are the same and everything should be compatible, but then look at
this info from Coolermaster:
…?! Very difficult for anyone to navigate with confidence.
There’s a big Reddit thread
here of loads of people trying to figure out what the deal is and who, if anyone, is being misleading.