Videocardz: The RTX 5090 is ~20% faster than the RTX 4090 in gaming, according to reviewers they've spoken with
https://videocardz.com/newz/nvidia-geforce-rtx-5090-3dmark-performance-leaks-out
On average, gamers can expect about a 20% performance improvement over the RTX 4090, according to reviewers we spoke with.