[SOLVED] RAM Compatability

Solution
2666mhz is the fastest memory that is compatible with that motherboard, regardless of what CPU is installed, however, if you only have an i3 or Pentium, anything other than an i5, i7 or i9, then only 2400mhz is supported.

2666mhz is ONLY supported when using a Core i5, i7 or i9 based on the memory QVL for that board.
2666mhz is the fastest memory that is compatible with that motherboard, regardless of what CPU is installed, however, if you only have an i3 or Pentium, anything other than an i5, i7 or i9, then only 2400mhz is supported.

2666mhz is ONLY supported when using a Core i5, i7 or i9 based on the memory QVL for that board.
 
Solution
Your Mb supports 2666/ 2400/ 2133 MHz.

With OC RAM there is no guarantee you will reach the rated frequency.
It is the IMC on the chip that determines what frequency can be achieved.

When buying RAM it's best to select a single kit at a size you need and a frequency your MB and CPU supports and chosen from the MB QVL. That way you know they have been tested and known to work.
Here is your QVL: Choose the QVL corresponding to what CPU you have.
https://www.msi.com/Motherboard/support/B360-GAMING-PLUS#support-cp