as @geloxo mentioned, MSFS use already a lot… most users only check the memory usage in taskmanager, but thats not the whole truth. You must check the commited memory too ( resourcemanager, or activate the columns in taskmanager detail tab ) - we have some topics ( working vs commited memory ). And because of these there are users with 32GIG RAM where the pagefile is highly used. As former mentioned, I have a 1gig pagefile only and that mean, nowhere is the slow disc-drive involved, all happends in RAM in my case.
Whether the difference of ddr4 and ddr5 is it worth, I cant really say. But on the list for my next pc is DDR5 ( 2x32 ) 
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