As mentioned, some RAM manufacturers prepare CUDIMM for up to 9200MT/s on Z890, and I know they tested it on all leading mobo brands (count it as ASUS, ASRock, Gigabyte and MSI, but only some single models). It will be higher, but my sources confirm the initial max is "only" 9200MT/s out of the box. Maybe one of the brands will surprise us with 10k+, but I doubt it will be just after the premiere.
My sources also confirmed that the regular DIMM should overclock higher, above 8400MT/s on an average CPU, and can count on 8800MT/s on most CPUs and the current Hynix A/M IC. It's based on ES CPUs, so nothing is guaranteed. Raptor Lake is so random that some CPUs can't even run at more than ~7200MT/s. My worst 14900K actually couldn't even post with RAM at 7400.
On the other hand, I expect it will be empty numbers again, and the performance gain over 6400-7200 will be barely visible. We can't really see much in synthetic benchmarks above 7200MT/s, so anything higher is expected to be amazing only on paper.
My sources also confirmed that the regular DIMM should overclock higher, above 8400MT/s on an average CPU, and can count on 8800MT/s on most CPUs and the current Hynix A/M IC. It's based on ES CPUs, so nothing is guaranteed. Raptor Lake is so random that some CPUs can't even run at more than ~7200MT/s. My worst 14900K actually couldn't even post with RAM at 7400.
On the other hand, I expect it will be empty numbers again, and the performance gain over 6400-7200 will be barely visible. We can't really see much in synthetic benchmarks above 7200MT/s, so anything higher is expected to be amazing only on paper.