intel states the 12900ks is only capable of support UP to 4800 mt/s
No they don't. That's the maximum rated memory speed, not a limit. Anything beyond 4800 is an overclock and not guaranteed but any 12900K should do 6000+ without a problem.
this post was submitted on 27 Nov 2023
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got the 12900ks for sub 300 as im upgrading from a 4 year old ryzen 5. ill jump to a 14900 in a year or three when the next gen are out
Also I’m using 6400 on my 12900k
You don’t need z790 for 12.9k. 690 is fine.
Its fine. You can do 6400 even. Higher with some luck. Probably not with kit.
Unless you're running a lot of memory (think more than 64gb) you won't have any trouble below DDR5-6000, most Intel CPUs run up to DDR5-7000 just fine.
Make sure you're running the latest BIOS version, they do improve compatibility and stability for fast memory from time to time.