Why don't 4 identical ram sticks want to work together?

Question

motherboards

Good afternoon. The situation is the following.
The computer had one 16GB stick. I bought three more of the same to get 64GB.
I put them in four - the BIOS sees that all the dice are 2666 MHz and cuts them to 2133 MHz. I can't understand why. The dies are identical - all 2666 MHz. The mother asus b365m-a supports 4 dies of 16 with a frequency of 2666, the bios is the last one out of the box. Proc 9700 - also supports.
I checked each die one at a time, two in different pairs - always a frequency of 2666. But if you plug in all four, it cuts up to 2133. I tried to swap - to no avail.
Any ideas?

Answer 1

In general, the problem went away as mysteriously as it appeared.
We decided to give the computer to the service center of the store where we took it, since it was not two weeks old.
We decided to shoot the problem on video, they say everything is ok with one die, ok with two, but with four - that's the trouble.
And after I put the dice one at a time, two at a time, and then all four - it all worked.
I reset the bios to check - it still works, all the dies are at a frequency of 2666. I ran
various memtests all weekend and the result is the same - everything is in perfect order. The strange thing is that I re-plugged the dies almost a dozen times to no avail, and then suddenly everything became ok.
Very strange, I've never seen anything like it. Usually I just took 4 identical dies and didn’t take a steam bath, there were no problems.
Here is such a performance that either my mother or my memory staged for me.
Thanks everyone for the advice and help!

Answer 2

https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/PRIM...

Answer 3

Okay, well, the bios itself resets to 2133, and you set it to 2666 with your hands, and what happens?

Answer 4

Most likely the reason is in the memory itself. To work in two-channel mode, it is possible to install only one bar per channel, and you put two.
P.s. this is the so-called flashed memory (i.e., overclocked frequencies were sewn into it. In fact, it is 2133)

Answer 5

Are the slats double or single tier? Usually dual-ranked ones operate at lower frequencies and are worse chased than single-ranked ones.