Thank you all for your information.
All higher-end gpus have 2 or 3 connections, so if for example i power 1x3070 which has 2 connections there should be no melted connectors? because 2 connectors would be able to support up to 300W?
If so, then this melted connector problem should only apply to really powerful cards, like 3080ti, 3090
Also count the connectors vs the power rating of the GPU. Some 300W cards have 2x8 some have 3x8.
I shouldn't need to explain what that means.