RAM chips are changing. Here's how 2021 ROG laptops are affected | ROG - Republic of Gamers Switzerland
Laptop DDR4 caveats - x8 layout versus x16 versus single and dual channel
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