
One of the Quasar Zone forum users published a photo that shows The power cord of your GeForce RTX 5090 blacks. The photos shared on the forum suggest that the power connector melted, at least on the side of the cable.
The user reported that the board was presenting blue screens and therefore he checked the GPU, discovering damage to the power connector. Apparently, The GPU is still working, although it is unclear if it is totally intact or if only the power cord needs to be replaced.

It will issue a RMA and, as MSI is the most involved company, it is expected to intervene to investigate how it happened. According to the user, The only activity was to play at 400 W for two hours, which should be within the GPU capabilities of US $ 3,150.
In kabum, you can find RTX 5090 ranging from $ 22,999 to $ 29,999. And the high price would justify greater durability of the connectors.
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Care gives MSI

MSI has launched a new line of power supplies, now equipped with a 12V-2 × 6 power connector. The version is safer and has shorter detection pins that prevent the cable from providing more energy if the detection lines are not connected correctly.
The same type of cable is used for official feed adapters provided with the new RTX 50 GPUS.
MSI was the first company to introduce the concept of color food connector to new video cards. The bright yellow color on the male side is designed to indicate to which point the connector should be inserted into the GPU power socket.

Thus, if users can still see the yellow color, it means that the cable is not fully inserted. The design was created to minimize user errors, especially after the first reports of RTX 4090 were labeled as a user error by NVIDIA and the media that investigated the problem.
However, three years after the launch of RTX 4090, GPU repair workshops are still fixing these signs. This suggests that it may not only have been a user error.
Fonte: QuasarZone e Videocardz.

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Source: https://www.adrenaline.com.br/hardware/conector-de-alimentacao-amarelo-12v-2×6-da-msi-fica-preto-apos-queimar-numa-geforce-rtx-5090/