What happens if you install RAM with a higher frequency than the motherboard and processor allow?

Question

RAM

I have a motherboard, the RAM (DDR4) buses of which do not support a frequency of more than 32 Gb and 2133 MHz.
I want to install two sticks of 8GB of RAM but the clock speed of the RAM is 2666 MHz
. Will the RAM work, and what will be the result?

Answer 1

The memory will run on 2133.

Answer 2

it doesn't matter
if the voltage is right