Videocardz posted an article on NorthridgeFix's attempt to repair 2 RTX 5090FE. TL;DR version is that since the FE use ribbon cable and connectors like those on mobile phones and laptops, it's very easy to damage the connection. They can't even find repair parts so one of the card is effectively unrepairable. Double checking Techpowerup's article, it looks like it's extremely hard for the average user to even re-paste the card. NorthridgeFix's advise is to just buy the AIB partner cards especially if you plan on watercooling. I included the MSI Suprim version for comparison.
videocardz.com
www.techpowerup.com
www.techpowerup.com
FE card's PCI-E connection

MSI card's PCI-E connection, it's a traditional design

GPU repair shop warns against RTX 5090 Founders Edition: fragile internal connector and lack of spare parts - VideoCardz.com
NorthridgeFix says it may be hard to repair RTX 5090 Founders Edition, because there are no spare parts In a new video, NorthridgeFix documents a teardown and repair attempt of an RTX 5090 Founders Edition and advises owners not to open or modify the card. The case involved two RTX 5090s that...
NVIDIA GeForce RTX 5090 Founders Edition Review - The New Flagship
NVIDIA's GeForce RTX 5090 is the fastest graphics card ever released. It comes with a whopping 32 GB VRAM, and support for multi-frame generation, which achieves hundreds of FPS easily. We also managed to disassemble the card, and our review includes performance testing without upscaling or...
MSI GeForce RTX 5090 Suprim SOC Review
The MSI GeForce RTX 5090 Suprim SOC is the best RTX 5090 custom design that we've tested. Thanks to its large cooling solution, paired with perfect fan settings, it's the quietest card available, much quieter than the Founders Edition. Thanks to the factory OC you also get some extra performance.
FE card's PCI-E connection

MSI card's PCI-E connection, it's a traditional design
