Coming back to this. Right now I have an i5-8400 on a z370 mainboard. I want to still use a 65W part, so I could upgrade to an i9-9900 without having to replace the motherboard. Or I could replace the motherboard and go with 10900 or 11900 CPU.
Am I going to see a considerate gain in gaming with 9900 over 8400? And 10900/11900 vs 9900?