Its an i9-14900k, 4x 16gb ddr5 6000 ram.
Is there some kind of limitation with that speed ram?
OK, the AMD 7000-series CPUs have less efficient RAM capability than Intel's 12th-14th gen. It's the CPU RAM controllers this gen of CPUs are the issue. Maybe next-gen will handle it better, IDK.
Intel is more efficient, but if you want to use the super-fast RAM (ie 6800, or 7200), then only use two of them. All four will be much less likely to perform at its highest rated settings (when going above DDR5/6000). Also, the bigger the RAM stick in size, the more likely it will lose stability at higher speeds. 4x 8GB DDR5/6000 sticks usually have more chance of working compared to 4x 32GB @ 6000.
However, I think DDR5/6000 with four sticks in place on an Intel has a better chance at performing at, or near full speed. I would start with ONE DIMM, in bay A1 or B1. Make sure everything works.
Then, I would add the second DIMM. Ensure that everything works, with no overclocking (so it will likely be running at 3400MHz or so). Finally, put in the other 2 DIMMs and see if you boot. Check for stability.
Once that is going smoothly, I would remove 2 of the DIMMs. Next:
Go to XMP profile settings in the EUFI/BIOS, and enable XMP. If the DDR5 is XMP, not EXPO, it should automatically enable the profile of the RAM at its rated 6000MHz speed. Try profile XMP1, then if that's kinda unstable, try XMP2. Note: Even DDR5 with Expo can still work with XMP, but a little more tweaking might be required, it's a crap shoot. Check to see if those 2 sticks of RAM work with XMP enabled.
If it does work, then go BACK to regular/slow speed, add the other two sticks of RAM.
Try it with base clock speed. Then, enable XMP and see what happens.
If it breaks again:
Revert back to no XMP, and set the RAM to run at 5400MHz in the BIOS overclocking section, and see if it works. Incrementally increase or decrease RAM speed until you find the "sweet spot" where it's stable, running as well as that RAM can work for that PC.
For example, I have 4 sticks of DDR4/4000 RAM, but it runs stable only up to 3600MHz when it was in one of my computers. Runs fine at 4000 in the MSI 13700k.