PCIe power connector design linked to melting GPU cables

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12VHPWR and its revision 12V-2x6 (H++) are modern PCIe power connector standards published by the PCI-SIG that aim to deliver more power to PCIe devices such as GPUs but in a smaller foorprint than the older PCIe 6- and 8-pin connectors.^{[citation needed]} Since 12VHPWR's debut on Nvidia's RTX 40-series GPUs, the connector's been infamous for its design flaws that make it quite prone to ignition. The minor revision 12V-2x6 aimed to mitigate these issues but ultimately succumbed to it's predecessor's shortcomings. As of July 2025, there are still reports of the connectors catching on fire even when using accessories that advertise less risk of catching ablaze.

Background

An early iteration of the connector, not part of the official specification, without the sense pins first appeared on PCI-SIG member Nvidia's RTX 3080 Founder Edition (FE) graphics cards. Since then Nvidia has used the connector on some of their RTX 40 Series GPUs and all RTX 50 Series GPUs.

Melting connectors

Since its first debut on the RTX 4090, the connector has faced a myriad of incidents all revolving around them melting. As an effect Thermal Grizzly, a computer cooling company started by XOC enthusiast Der8auer, cannot guarantee their WireView, that uses the connector, as fail-proof.

Initital round of investigations led many to blame the incident on user error. Referencing improper insertion of the connector into the receptacle, leading to subpar contact between the conductors. In Nvidia's official statement they declared to have come to the same conclusion from their investigations. The company still offered an expedited RMA process for any RTX 4090 affected by the melting connectors. Following Nvidia's statement, PCI-SIG released their own in which they state "Members are responsible for the design, manufacturing, and testing, including safety testing, of their products".

Industry response

Despite the gaping shortcomings, the connector was formally adopted as a part of PCI Express 5.

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