combining different RAM

[MasslxD]

Hello, 

I just bought "16GB G.Skill RipJaws V black DDR4-3200 DIMM CL16 Dual Kit" and was going to replace my "8GB HyperX Fury DDR4-2133 DIMM CL14 Dual Kit" once i get it delivered. 
but now a friend of mine asked me why i wont use them together and get 24GB. I told him they are not compatible but to tell the truth i dont really know if thats the case with "modern" Ram and Motherboards.

I´ve an ASRock B150M Pro4S Motherboard and i know that the RipJaws will be restricted to 2133MHz and i dont really mind since im going to upgrade my PC in a few months and got the RAM for a nice price.

So i just want to know if its possible, and it doesnt really matter if its not, since 16GB is enough anyway. 

 

[Zagna]

Flex mode

First 16GB can be accessed with dual channel speed, last 8GB will be slower. That's all.