> RAM requires constant power. If you lose power, you lose data (more-or-less instantly).
It's perfectly fine for some uses, mine included.
> I'm going to go out on a limb and say the approach you're considering is practically infeasible.
To each his own, but I know for a fact that hardware RAM drives were indeed sold in the past, and after posting this Ask HN I've stumbled upon companies marketing them.
https://ddramdisk.store/2023/01/19/the-ddr4-pcie-x8-lady-has...