I went from a 12700k to a 14900k. I say get the i9 if you’re not already on an i9. I think the memory controller is pretty decent and I haven’t had any issues running 48gb DDR5 at 7200mhz CL34. I tried to run higher frequency and tighter timings but I was running into stability issues. So what I have is perfect but I am also not the best with manual OC so there’s also that. But also has a lot to do with your motherboard with these chips. I had to switch from an MSI z690 MPG force WiFi to an ASUS z790 Maximus Dark Hero to have better ram stability.
Went from 12700k to a 14900k and don’t regret it at all. Definitely go DDR5. I’m running 48gb DDR5 7200mhz CL34 no issues at all. Motherboard: Asus z790 Maximus Dark Hero