[OJFord]

I should probably sort through some old boxes and eBay stuff I've saved for no reason in particular, not like it's (I hope!) going to get any more valuable than it already isn't, and I'm not realistically going to build Frankenstein DDR1/2/3 systems rather than use a more modern and low-power Pi/SBC or NUC for the purpose, even if I need to buy the latter!

[zozbot234]

If you're okay with DDR3-like memory bandwidth you can get that cheaply on a modern system by getting Intel Optane NVMe/PCIe media (solid state storage much like NAND, but wearout-resistant well beyond even the best SLC NAND) and setting it up as swap. If you're either memory-bandwidth bound (common for local AI, not so much otherwise) or not OK with the power reqs of Optane, you're going to need actual expensive DRAM.

[OJFord]

I'm not in the market for RAM (or RAM-like), I just have a surplus of quasi-obsolete hardware!