You may want to rewrite this part as it does not make a lot of sense so it is hard to respond to it.
I mean, I need a speed of 3200 RAM, and the problem of random restarts, after disabling XMP RAM, returned after a few days.
Just because you are not using XMP does not mean you cannot clock the memory manually to get the full speed.
This is true, but there is a problem when XMP is on or off. This means that the problem is probably from somewhere else
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A short description so far for someone who might have a similar problem:
1- I checked the backplate carefully and there was no non-virtual contact and it was not a problem with the backplate.
2-For about 9 hours, I tested the memory with the MemTest86 software single and multi in XMP mode, it happened twice between restarts, but in the end, after 6 passes, no error was found. I think the problem is not with RAM and XMP profile.
3- I downgrade the BIOS of the motherboard to the old version (the original version I had), and the problem was not solved. Of course, I realized that MSI removed one of the BIOS versions that had the most bugs from the site!
4- I read in the Windows eventvwr section that displays Windows errors that the reason for the restart is lack of power (Kernel Power 41 (63 Windows 11)). After searching, I realized that this error is often for power or RAM or a hardware that protocols Enables power security
5- I have 2 PSUs of exactly the same. I replaced the PSU some time ago, and it is unlikely that both of my psu are damaged. So this time I replaced all the power cables.
For now, the problem is solved (everything is fine with a change for a few days), but I will test again for a few days and update this post again.
In the next step if the problem is not resolved. I have heard a few places about fan hubs being incompatible with 690 motherboards. Currently, I am using a deepcool fan hub and in the next step I will remove this part - but I think this is unlikely because sometimes the PC turns off within a few seconds of turning on, and this really looks like a power problem.