Don't buy these because it can't do 8000+ isn't a very good argument. First, it doesn't change the fact that no 4-DIMM slot Z690 MB can run 6933+ stable (or even boot). What about all the folks who just want 6000 MT/s memory?
Also AMD AM5 platform should be go-to in 2 days anyway.
I already read something about it:
DDR5-6000 is looking to be the sweet spot for AMD Ryzen 7000 "Zen 4" AM5 Desktop CPUs, offering a 1:1 Infinity Fabric ratio with EXPO support.
wccftech.com
Higher frequency DIMMs are supported but as soon as you go above the DDR5-6000 limit, you will drop down to a 1:2 IFC. We are told that DDR5-6400 running at 1:2 will produce poor results and is not recommended if you are looking for better gaming performance.
There's a couple of strange statements here to me. 1:2 IFC all the way up to 3000 MHz IF, that is pure wrong.
Because here it says it is 1733 by default and it goes up to 2000, rare ones more than 2000:
AMD Ryzen 7000 memory sweet spot it DDR5-6000 Robert Hallock, Technical Marketing Manager for AMD, confirmed on official Discord channel what would be the best memory configuration for Ryzen 7000 series. For Ryzen 7000 series, the best choice for DDR5 memory would be 6000 MT/s. By sweet spot...
videocardz.com
I also take it from what was written that AUTO FCLK has a fixed value of 1733. Or maybe you can even set it manually.
Then only above 7000 it is worth setting FCLK:UCLK:MCLK to 2:1:1. At DDR5-7200 FCLK would be 1800 MHz.
But what I didn't account before reading your post, AMD will probably also have some DDR speed limit, like you say it is 6933 for Z690.
What if X670 only goes up to 6400 or so. Then really no point in buying Hynix RAM. They are more expensive than now easily obtainable Samsung 6000 36-36-36 (260€).
What about UCLK (memory controller) limit? But that shouldn't be a problem, at least on X570 you could set UCLK = MCLK/2.
There will probably be some good AM5 OC guides out there anyway.
Then another strange thing I read here, P4-630 says his 6000MHz 36-36-36-76 are SK Hynix. Does Hynix really make 36-36-36? Because G.Skill Hynix are 30-38-38 and 30-40-40 and 32-38-38.