I fly normally MSFS2020/24 and actually have installed 32 GB Ram DDR5 7000.(2 X 16).- I acquired recently 64 GB RAM DDR5 6400 (2 X 32) and am in doubt about adding them, keeping my actual 2 X 16 sticks, or just replace them with my new 2 X 32 sticks. I wonder if there is any incompatibility, and which are the advantages of both options, provided that both memory packs are from diferent brand and speed, and that 96 GB  seems too much for the moment.- I had been told that being diferent channels, there is no problem installing diferent brand  and speed memories, I wish somebody with knowledge about the subject, can confirm it. Thanks

 

24 minutes ago, solito said:

I had been told that being diferent channels, there is no problem installing diferent brand  and speed memories, I wish somebody with knowledge about the subject, can confirm it. Thanks

It's not recommended. Mixing memory often leads to instability. I'm sure you'll find 64GB is more than enough for all current requirements.

It is best if all of the RAM is matched in terms of manufacturer, speed, timings, and capacity.  You will likely get better performance with two larger capacity sticks than four smaller capacity sticks.  Mixing manufacturers, speed, timings, or capacity will likely lead to stability issues and maybe even a failure to boot.