The issue first came to widespread attention when Igor’s Lab reported issues with its GeForce RTX 5090 Founders Edition. Igor writes that the card simply would not work with risers or adapters without limiting the speed to PCIe 4.

The best argument for grabbing a 5080 right now, if you can find one at $999 in the first place, is that the only cards that come close to its performance are either way more expensive than they're supposed to be (the 4080 Super) or not cheap enough to justify the Nvidia-specific features you give up (AMD's Radeon 7900 XTX).