After the crypto miners dumped them (that was, what, 2 years ago?), I saw one of the entire rack systems on eBay- I think they held 12 of these in one rack on a common backplane - for $800. (or maybe less?)
That's $66 per BC-250.
And the alternative of getting a gpu, cpu, ram, storage is like 5 times as expensive.
The CU's is genius though, I didn't know about that.
These GPUs physically have 64GB RAM but locked to 8GB RAM. You can unlock all 64GB RAM with a patched driver.
They used to cost $200-250 but now cost $700+.
But the cards themselves are extremely limited in function, necessitating either board level work to reconnect the electrically disconnected traces or transplanting the hardware to a new board. It's anything but plug and play.
https://niconiconi.neocities.org/tech-notes/nvidia-cmp-170hx...