A:Answer OK I can understand the LENOVO rep spouting the party line, and not knowing either how the chips and CPU work... but really should be able to read Lenovo-speak in the tech documentation even for this laptop.
For others who choose to make noise in the echo chamber, well you might as well test before you speak, or keep silent, since it misleads many to parrot incorrect information.
So:
1. This machine can do DDR4 3200 in dual channel, with 22-22-22-54 timing (standard JEDEC 12/13), using two (T W O) up to 32 GB RAM modules, 64 GB total. 64GB is the limit, its architecture not Ideapad 3 design causing this 64GB limit (e.g., not Lenovo's fault).
2. Modules do not _have_ to match (I wont go into a modern memory controller diatribe for DDR4). Only on rare cases (eg, by exception) will it not work to mix.
3. If you mix an 8GB and a 32 GB, for example, you will 8+8=16 in Dual Channel mode, and memory use beyond 16GB will be single channel. On this machine, that means a significant performance hit if that single channel is used, unlike the Legions (which have a different NB/SB/CPU setup on the Mobo). But it will work fine.
4. This exact machine will get a HUGE performance increase going from 8GB single channel to 16GB dual channel. Huge, including about 10 to 15% FPS using the 3050ti.
5. Performance to 16+16 and 32+32 is negligible, for general use and for gaming. More RAM is good for things like video editing of course, but if you do that a lot (or professionally), you do not want a 6-core machine with this mobo architecture to begin with.
