I recently read something about your problem. 
Link Below:

https://forums.tomshardware.com/threads/mixing-ram-will-it-work.2965108/

I've had this before on my computer with different RAM stick voltages for DDR3. I didn't have to make any changes to voltages in BiOS. worked fine

Hi guys, I recently picked up another stick of RAM for my PC and thought it was the closest match to the one I currently have which is now discontinued. However while the clock speed and memory are the same I didn’t even notice the new one is 1.35v while the old is 1.5v, will I be better off to overvolt the new stick or downvolt the old one? For reference the old stick is a Crucial CT102464BA160B and the new one is a Crucial CT102464BD160B.

Wrong voltage RAM