Testing suggests that a faulty cable may be causing the RTX 4090 to melt connectors

Zoom in / The power adapter for the RTX 4090 provides four 8-pin power connectors into a single 12VHPWR connector.

Sam Machkovech

Earlier this week, two Reddit users reported that the power connectors for their expensive new Nvidia GeForce RTX 4090 GPUs. It was partially melted Nvidia is looking into the issue. Since then, at least nine additional Reddit users have posted about the same problem with the 16-pin power connector (the thread that collects all the information about the problem Here)

Igor Wallossek of German-language hardware site Igor’s Lab Additional testing was conducted, and said that the power adapter cable (rather than the GPUs or the 12VHPWR connector) may be causing the problems. The adapter is apparently manufactured by a company called Astron And Nvidia provided all of its board partners with “a total of four thick 14AWG wires distributed across a total of six contacts,” with a thin solder base that Walocheck says can be easily damaged when cables are moved or bent.

The solder cables inside Nvidia's power adapter cable can be damaged if moved or excessively bent.
Zoom in / The solder cables inside Nvidia’s power adapter cable can be damaged if moved or excessively bent.

“In the worst case, if the two outer wires break, the entire current in the middle will flow through the remaining two wires,” Walocek wrote. “The fact that it becomes so hot doesn’t need to be explained in isolation.”

Connect Nvidia’s adapter cable to the 12VHPWR cable and relax! The Dark Power Pro 13 power supply is one of the newer ones ATX 3.0 PSU models With a 12VHPWR cable, it connects to the PSU without relying on an adapter. The cable is thicker than the one on Nvidia’s adapter because each pin has its own wire, but it runs cooler and provides reliable power to the GPU.

Walosek said Nvidia has told its partners to send all affected cards back to Nvidia for further investigation and testing. We reached out to Nvidia about the issue and investigation earlier this week, and will update if new information becomes available.

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