PCIe riser cable partially melted by heat from RTX 5090 GPU

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A Reddit user's RTX 5090 has partially melted a PCIe riser cable

Some of the riser cable's material is stuck on the RTX 5090's backplate

It's not as serious a concern as connector melting issues, but it's worth being cautious about riser cable and GPU spacing henceforth

Building a new gaming PC in 2026 and beyond is a tough ask for any gamer amid the RAM crisis, and that's why this case of caution around hardware components is vital.

As reported by TweakTown , a Reddit user has reported a partially melted Lian Li PCIe riser cable due to heat from direct contact with the Asus TUF GeForce RTX 5090 backplate. The material chipped away from the riser cable is evident on the GPU's backplate, but fortunately it isn't a substantial amount.

Riser cables are an ideal solution for any PC builder aiming for a small case that can fit larger GPUs by placing them in a vertical position. In this case, the user specifically notes that the riser cable was stuck against the GPU's backplate during a routine PC cleanup, suggesting that the GPU's heat melted the riser cable's insulation.

It shouldn't come as a huge surprise that the RTX 5090 is involved in a case of components melting (even if it's very minimal). In case you've missed them, there have been several cases of GPU power cables melting with RTX 5090 GPUs, which stems from the high power draw (575 W).

It's important to note, though, that this can happen with other GPUs across AMD's Radeon and Nvidia's RTX cards, especially those that can get quite toasty under heavy load. However, Team Green's flagship is likely more prone to melting complications, made worse when using cheap riser cables or GPU power connectors.

Rtx 5090 melted riser cable from r/pcmasterrace

(Image credit: Future) Fellow Redditors argue that this isn't a melting issue, as it appears the riser cable has been chipped away instead. Regardless of the exact cause, it's best to use this as an example to proceed with caution when mounting a new GPU.

If using a riser cable is required due to space limitations, users must provide enough clearance for both the GPU and the riser cable to avoid direct contact. It's a great thing that this user caught on to the matter before any real issue arose.

We've reached out to Nvidia to see if it has any comment on this particular case, but haven't received a response yet — but I'm sure the same warning of caution will be shared.

We've seen rare but far worse cases of GPUs melting, and given how expensive it would be to buy new PC hardware, I'd go so far as to suggest users be overly cautious.