

DDR 2 was expensive when new.
DDR3 wasn’t massively. I have about 20 or 30 2GB and 4GB DDR3 SODIMMs in a bag right here. There are a handful of 0.5 and 1GB ones in there too.
I wish someone made a cheap mini PC with four DDR3 SODIMM slots. I could provision at least 3 machines with 16GB each, no problem.
Here’s a more realistic solution for folks with phat GPUs who don’t game 24x7: swap to VRAM. There were patches for this years ago, and it was revived earlier this year:
https://github.com/c0dejedi/nbd-vram
Make that generic and cross-platform so it works equally well on AMD and any other weirdo GPUs out there.





Not really, no.
Optane was RAM that was on the CPU bus, but nonvolatile. No need for disks. Boot, and just turn off; when you turn back on all your RAM contents are still there.
You’d need some normal RAM. Optane was big and fast but it had a finite number of write cycles. 3 orders of magnitude more write cycles than Flash, and Flash can only be rewritten a whole block at a time while Optane can be rewritten 1 byte or 1 word at a time, but you’d still need a few gigs of plain old RAM as workspace… plus another terabyte of RAM that held its contents forever.
The basic plan is called Single Level Store and it’s much older than Unix itself. IBM i is the only modern shipping single-level store OS.