David_24 :
is 32 gigs of fast ddr4 better than 64 gigs of slow ddr4?
If you're using more than 32GB of RAM, then the 64GB option will be better as you won't be paging, otherwise the faster RAM should be better. Note that you will only really see a performance benefit from faster RAM when in memory-intensive operations, e.g. file compression (assuming you're not I/O limited), image processing (would need to be large images), video editing, running multiple VMs, (large) data set comparisons, scientific simulations, etc