Nvidia’s use of the 16-pin power connector has raised fire hazard concerns, as a Greek PC gaming site found a melted cable in its last-gen RTX 4090 GPU. Despite the melting, the cable still functioned normally with the card. The incident highlights the potential risks associated with the design of the 12VHPWR connector, which has been criticized since its introduction with the RTX 40-series GPUs. Experts warn that users should inspect their power connections for similar damage, as more incidents like this may occur in the future.
Source: https://www.tomshardware.com/pc-components/gpus/official-rtx-4090-power-cable-found-melted-by-reviewer-2-years-later-card-functioned-fine-despite-hidden-melted-connector