Most ryzen motherboards support 128GB ram and they cost as low as $50
And DDR memory is free, of course 
As I said, 128GB not-fancy DDR4 is $500, not $3000
Or maybe even lot cheaper, just not sure how safe this is:
https://ddramdisk.store/shop/
but it should work in your motherboard, despite 32gb restriction
It is not RAM. The description says: "RAM disk, this is a “SSD” disk based on RAM memory chips. This kind of disk has an exceptionally high read/write speed and an unlimited lifespan. To the operating system the RAM disk is indistinguishable from an SSD or HDD disk and no special drivers or setup is required."
It is not RAM, but description says it is a RAM?