A Redditor reported a troubling issue with their RTX 5090 setup when their monitor unexpectedly displayed a “DisplayPort not connected” error, initially prompting them to reinstall drivers and contact NVIDIA support. The true cause was revealed to be melted power cables connected to a Corsair HX1500i 1500W PSU, which should have been more than sufficient for the system’s power demands. The issue stemmed from the cable’s inability to handle the heat generated, despite the PSU’s capacity. Notably, the yellow tip on the RTX 5090’s power adapter, a feature specific to MSI’s 12V-2×6 cables and adapters for the RTX 50 series, is designed to ensure proper cable insertion by indicating if the connection is not fully seated.
Source : Reddit
While this aims to prevent user error, it doesn’t address potential issues like cable quality or thermal limits. Fortunately, the GPU itself showed no damage, with the cable absorbing the brunt of the issue. This incident has sparked discussions on the PCMasterRace subreddit, with a related thread removed from the NVIDIA subreddit, though a dedicated thread for such cases exists.
At least six similar incidents have been confirmed, fewer than the RTX 4090’s notorious 12VHPWR connector issues, raising questions about whether the root cause is user error, manufacturing defects, or design flaws in the power delivery system, particularly given the Blackwell GPUs’ lack of per-pin current monitoring and limited load balancing.
Source : Reddit