RTX 5090 backplate melts PCIe riser cable insulation in vertical mount

An RTX 5090 owner discovered melted insulation on a PCIe riser cable pressed against the GPU's backplate in a vertical mount. The incident occurred with an ASUS TUF Gaming RTX 5090, where the riser cable's plastic insulation fused to the backplate, though the graphics card itself appears undamaged. This issue highlights potential heat and airflow problems in vertical GPU setups with high-power cards, suggesting users check for adequate clearance.