RTX 4090 12VHPWR Adapter Melts Despite 80% Power Limit

A Reddit user reported that the 12VHPWR adapter on their Gigabyte RTX 4090 melted even though the card's power draw was manually capped at 360W (80% of its 450W limit). The GPU itself survived; only the 4×8-pin to 16-pin adapter was damaged, used with a 2021 Corsair RM1000x PSU lacking a native 12VHPWR connector.

• Card was manually power-limited to 360W, 80% of its 450W peak
• The 4×8-pin to 16-pin adapter melted, not the GPU itself
• PSU was a 2021 Corsair RM1000x without a native 12VHPWR connector
• Random black screen issues preceded the melting