Newer RTX 4090 models have taken steps to address this problem. Changes have been implemented, such as the repositioning of the 16-pin power connector to ensure a better connection. An improperly seated connector had been identified by Nvidia as a potential cause of cable melting.
Additionally, a redesigned specification featuring a 12V-2×6 power connector, instead of the original 12VHPWR, has been introduced to circumvent connection issues. This updated specification now appears in new RTX 4090 graphics cards, successfully avoiding connector-related problems.