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I have seen other burned 12Vx2-6 cables and GPUs, but never thought this could happen to me as I had undervolted my GPU, always very careful with the connector at the GPU/PSU and have what I thought was the best MSI Power Supply possible, but to my surprise it did happen to me. In case it helps anyone the first systems was when starting a game my screen would go black, and although I had sound of the game it was not displaying my game, and I thought maybe it was a bad CPU or RAM tuning/OC, but no, it was my cable and PSU burning. I restarted my PC and game worked, but it was too late and stopped playing. The next day I tried to play again and same behavior, that is when I decided to check my GPU and PSU connection and to my surprise, a burned cable on GPU side, and really burned at the PSU end. My heart sunk thinking my watercooled 5090 FE that I have been running for 1+ years was ruined, but to my surprise the GPU socket was intact, thankfully.
I have contacted MSI, and I RMA my MSI MEG Ai1600T Power Supply, and I am waiting for an answer if they will repair or send me a new one. I am very skeptical now and I am thinking of getting the Ai1600TS with GPU Safeguard and may get the Thermal Grizzly Wireview Pro II Wired as I have a 5090 FE.
Be careful, and protect your hardware, it can happen to anyone.