Club386 is the latest victim of melted 12V-2x6 cable connectors, RTX 5090 and PSU both damaged

The infamous 12V-2x6 power connector has claimed another victim. This time it is the media outlet, Club386, whose GeForce RTX 5090 Founders Edition and their be quiet! Dark Power 13 PSU were both destroyed after a properly seated, single-cable 16-pin connection melted at both ends. The cable was not a third-party product, and the connector was fully seated. The team has been testing GPUs for decades, so it is unlikely to be user error, but none of that mattered.

5

NVIDIA has since replaced the GPU, but the damage was done, and the point stands regardless. The melting connector problem goes all the way back to the RTX 4090 launch in late 2022, when the original 12VHPWR standard started showing up in repair shops at an alarming rate. The root cause was uneven power distribution across the connector's pins.

Thermal camera testing by overclocker "der8auer" revealed one wire hitting 150°C on an RTX 5090 while other pins carried almost no load at all. When one pin absorbs the bulk of a 575W card's power draw, something burns.

5

The industry's response to this has been a long list of partial solutions that have not fixed the problem. MSI introduced two-color connectors to make improper seating more visible, then those connectors started melting too. GIGABYTE added temperature sensors to its T-Guard cables. Thermal Grizzly's WireView Pro II monitors power draw in real time and can trigger an automatic shutdown. Cybenetics even proposed an alarm-based adapter.

5

More interestingly, ASUS launched the $50 ROG Equalizer cable with per-wire load balancing, which has already been reported to melt. One user even tried modding a second 12V-2x6 connector onto their RTX 5090 to spread the load, and burned a hole through the PCB in the process.

5

The transition from 12VHPWR to 12V-2x6 was supposed to address improper pin seating by shortening the sense pins and lengthening the conductor terminals. It clearly was not enough. We have reported melted connectors on the RTX 5090, RTX 5080, RTX 5070, and even AMD's Radeon RX 9070 XT from partners who adopted the 16-pin standard. This is not a flagship-only problem anymore.

Club386 is calling for the connector to be retired entirely, and it is hard to argue with that at this point. With NVIDIA's RTX 60 series and AMD's RDNA 5 GPUs still a ways out due to ongoing DRAM constraints, there is a window here for the industry to sit down and design something better before the next generation lands. Whether that actually happens is anyone's guess, and it looks like we are stuck with melting GPUs for another year at least.