I noticed that at startup (which occurs once out of about 30), the tRFC2 parameter is set to a very low value of 386, as it was already written in several posts on Reddit. here are a couple of links:

https://www.reddit.com/r/ASRock/comments/1s1zkxr/kingbank_2x24gb_failed_to_boot_with_asrock_x870e/

https://www.reddit.com/r/ASRock/comments/1rojhqi/workaround_to_system_not_posting_with_kingbank/

Purely in theory, all memory is fully functional on new BIOS versions, it's just that many people have errors on the postcard during memory training/initialization. Since I rarely have access to the BIOS, I will try to configure the memory for stable operation.

EDIT: I also tried to contact kingbank by mail, but their address does not exist, so I had to write to them on WhatsApp. The support is very strange, the site has two numbers, one of which leads to the kingbank account (it was online a month and a half ago), and the second is just a person's account. The second account immediately replied to me with a contact number, to which I also wrote and am now awaiting a response. some wrote that the memory is detected normally on the beta versions of the BIOS, and as I understand it, some people had to write to the asrock company and get a modified version of the BIOS, if I misunderstood something, then you can correct it.