RAM runs at a reduced frequency instead of 2666 runs at 1333 why?

Question

RAM

8gb 2666mhz RAM runs at 1333 mhz
The motherboard supports this frequency even in the BIOS, everything is correct at 2666
The processor also supports this frequency
But it still works at a reduced frequency, what should I do?
Aida 64 says 2666 (1333) MHz

Answer 1

1333 in this case equals 2666.
In other words, everything is fine with you.