Question Asus b250m-k support 2400mhz

I have a 1066 mhz ram, if i buy a 2100mhz and install it in the other ram slot, will it be 3166mhz? or is it only 2100mhz for the ram slot?
No such thing as DDR4 1066, DDR4 2133 is the slowest DDR4, and using more than 1 stick the speeds do not add.
What ram speeds your board can use depends on the generation of CPU you are using.
"* Due to Intel® chipset limitation, DDR4 2400MHz memory frequency is only supported by 7th Generation Intel® processors. Higher memory modules will run at the maximum transfer rate of DDR4 2400MHz.
** Due to Intel® chipset limitation, DDR4 2133MHz and higher memory modules on 6th Generation Intel® processors will run at the maximum transfer rate of DDR4 2133MHz."
https://www.asus.com/us/Motherboards/PRIME-B250M-K/specifications/