How will different clock speeds of RAM affect stability?

Question

RAM

I would like to know what is the stability of a computer with ddr4 RAM of different clock frequencies (2133 and 2666) and timings (Cl 15 / Cl 17). I would also like to know about the possibility of Dual-channel in this case (the volume and manufacturer will be the same).

Answer 1

When booting up, the PC will select the smallest standard mode that both sticks support.
The dice can operate at any reduced standard frequency, this does not affect the stability of the work.
The dual channel depends on the motherboard, it may be important which slots are plugged into and what is selected in the BIOS.