I got a stable 5.3 at 1.389v ,i set an AVX offset of 2 , not for stability but because i don't use AVX outside of benchmarks so i didn't see the point in stressing the cpu in ways i will never get the advantage of. Temps were in the low 80's under max stress and 50's-60's whilst gaming.
As for longevity of the platform that's why i got the 10600k , i don't need anything more right now , Rocket Lake will be a completely new architecture so just like Ryzen there will be plenty of upgrade options to choose from 10900k's to whatever Rocket Lake has to offer. So unless you bought the highest tier cpu for your platform there are always upgrade paths for every platform to keep it relevant e.g The people rocking 2500k's , the 2600k and 2700k offer a great upgrade path (obviously price dependent), X79 users on 3820 i7's gave good options too , the list goes on and on.
Really nice results actually.
Agree to disagree on longevity, at least when looking at it from a cost perspective. The socket you're on will eventually limit you to chips of the same socket and historically Intel chips have been expensive in the second hand market, you're also looking at a refresh line at best before a change.
Don't get me wrong here, I'm not attacking your choice or even Intel in this regard. I do genuinely feel the 10600K is probably the best 'current' gaming CPU on the market for what it can do for a person willing to OC with the right setup, but I suspect those people are few and far between even in the enthusiast community.