VictoryPete, Thank you for posting in the Intel® Communities Support.
In reference to your question, the proper memory RAM for the Intel® Core™ i9-12900K is: "Up to DDR5 4800 MT/sUp to DDR4 3200 MT/s", as long as you use the memory within specifications it should work with no problems:
https://ark.intel.com/content/www/us/en/ark/products/134599/intel-core-i912900k-processor-30m-cache-up-to-5-20-ghz.html
Here you have the datasheet for the Intel® processor where you will be able to find further details about the memory RAM, page 104:
https://cdrdv2.intel.com/v1/dl/getContent/655258
Any questions, please let me know.
Regards,
Albert R.
Intel Customer Support Technician
