Solution For RTX 5090 GPU 12VHPWR Connector Melting!
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Sourceshttps://www.tomshardware.com/pc-components/gpus/diyer-creates-rtx-5090-countermeasures-with-cabling-spaghetti-to-mitigate-16-pin-meltdowns-system-automatically-shuts-down-when-the-overcurrent-protection-is-triggered.https://www.reddit.com/r/nvidia/comments/1mrh85i/rtx5090_countermeasures_for_connector_thermal/?utm_source=embedv2..
A PC enthusiast created a custom system to prevent thermal damage to GPU power connectors. The creator, known on Reddit as Electronic_Ear6797, built a device that will shut down a PC's power supply if it detects an overcurrent event. The system is a complex build, showcased in a gallery of photos. It is a precautionary measure against a problem that has been reported with high-power graphics cards.
Reports of melting power connectors began with the Nvidia RTX 4090 in 2022 and have continued with the new RTX 5090 released in 2025. This issue happens when the connector is not properly seated, causing a poor electrical connection that leads to heat buildup and melting. The persistence of the problem has led some users to create their own solutions.
The Redditor did not provide schematics for their creation, but they did list the components used. The system includes a Zotac RTX 5090, a Corsair power supply and cable, a Mitsubishi PLC (Programmable Logic Controller), an analog unit, a current sensor, and a power relay. These components are arranged in a way that monitors the power flow to the GPU and can trigger a shutdown if it exceeds a set limit.
The project received mixed reactions. Some users praised the effort and technical skill, while others questioned the design. There were suggestions that a simpler fuse system would work or that existing commercial products like the Thermal Grizzly WireView GPU could have been used. The creator's work is a response to an ongoing issue in the PC hardware community.
The system's effectiveness is not yet proven. It is difficult to intentionally replicate the cable melting issue, so it may be impossible to know if the countermeasures actually prevented a meltdown. However, the project highlights a concern within the enthusiast community and shows an example of a user-driven solution to a hardware problem.
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