Another Blackwell GPU bites the dust, as the meltdown reaper has reportedly struck a Redditor's MSI GeForce RTX 5090 Gaming Trio OC, with the impact tragically extending to the power supply as well. Ironically, the user avoided third-party cables and specifically used the original power connector, the one that was supplied with the PSU, yet both sides of the connector melted anyway.
Nvidia's GeForce RTX 50 series GPUs face an inherent design flaw where all six 12V pins are internally tied together. The GPU has no way of knowing if all cables are seated properly, preventing it from balancing the power load. In the worst-case scenario, five of the six pins may lose contact, resulting in almost 500W (41A) being drawn from a single pin. Given that PCI-SIG originally rated these pins for a maximum of 9.5A, this is a textbook fire/meltdown risk.
The GPU we're looking at today is the MSI RTX 5090 Gaming Trio OC, which, on purchase, set the Redditor back a hefty $2,900. That's still a lot better than the average price of an RTX 5090 from sites like eBay, currently sitting around $4,000. Despite using Corsair's first-party 600W 12VHPWR cable, the user was left with a melted GPU-side connector, a fate which extended to the PSU.
MSI 5090 Gaming trio OC melted cable (repost with pics) from r/nvidia
The damage, in the form of a charred contact point, is quite visible and clearly looks as if excess current was drawn from one specific pin, corresponding to the same design flaw mentioned above. The user is weighing an RMA for their GPU and PSU, but a GPU replacement is quite unpredictable due to persistent RTX 50 series shortages. Sadly, these incidents are still rampant despite Nvidia's assurances before launch.
With the onset of enablement drivers (R570) for Blackwell, both RTX 50 and RTX 40 series GPUs began suffering from instability and crashes. Despite multiple patches from Nvidia, RTX 40 series owners haven't seen a resolution and are still reliant on reverting to older 560-series drivers. Moreover, Nvidia's decision to discontinue 32-bit OpenCL and PhysX support with RTX 50 series GPUs has left the fate of many legacy applications and games in limbo.
As of now, the only foolproof method to secure your RTX 50 series GPU is to ensure optimal current draw through each pin. You might want to consider Asus' ROG Astral GPUs as they can provide per-pin current readings, a feature that's absent in reference RTX 5090 models. Alternatively, if feeling adventurous, maybe develop your own power connector with built-in safety measures and per-pen sensing capabilities?
