Is it worth upgrading?
A newer card winning every row of a comparison table does not make it worth buying. This works out how much faster it actually is at your resolution, what that improvement costs per percentage point, and whether a cheaper card would get you most of the way there.
Both cards have to be ones CompareYourGPU tracks. The database currently covers current and recent desktop cards, so if you are coming from something older it may not be listed yet. See what is covered.
Your card: RTX 5090
What should you upgrade to?
Every in-production card that is a real step up at 1440p, with what each one costs per percentage point gained. Pick a target card above for the full verdict on a specific pair.
No worthwhile upgrade from the RTX 5090
No in-production card CompareYourGPU tracks is at least 25% faster than the RTX 5090 at 1440p.