Beware of the single rank x16 RAM kits sneaked in some laptop models! The 1Rx16 modules have significantly lower bandwidth compared to the 1Rx8 variants - NotebookCheck.net News
windows 10 - Can I tell whether a computer has 1x16 GB memory chip or 2x8 GB chips without opening it up? - Super User
Results from swapping the 1x16 ram that my 7i came with with 2x8 ram from my old laptop : r/LenovoLegion