https://videocardz.com/newz/uk-retailer-expects-next-geforce-rtx-5090-shipments-in-3-to-16-weeks
5080 Meta Review https://www.reddit.com/r/nvidia/comments/1igzdlv/nvidia_geforce_rtx_5080_meta_review/
edit: If you are planning to buy 5090, keep in mind these issues pls https://videocardz.com/newz/some-geforce-rtx-5090d-5090-users-report-issues-following-first-driver-update and https://www.youtube-nocookie.com/embed/iSfBWJlTdR8 DeBauer fixed one of the issue by using PCIe Gen 4.0, some people fixed some issues by not using PCIe riser cable. But there are more issues as reported.
Lots of NVIDIA GeForce RTX 5090 & 5090D GPUs Are Getting Bricked, Possibly Due To Driver, BIOS or PCIe Issues
https://www.notebookcheck.net/Serious-RTX-5090-and-RTX-5090D-driver-issues-reportedly-turn-GPUs-into-expensive-paperweights.955982.0.html
https://www.reddit.com/r/ASUS/comments/1if73o9/rtx_5090_not_detected/
edit2: New driver, hopefully above problems fixed Nvidia Hotfix Driver Version 572.24
edit3: Troubleshooting RTX 5090 Black Screen Failures: Switch to PCIe Gen 4.0
Edit4: Nvidia says it's investigating RTX 50-series GPUs with widespread issues - Neowin
Edit5: 5080 / 5090 troubleshooting https://www.reddit.com/r/nvidia/comments/1idme1q/comment/maxaht0/