Usually offloading experts to system RAM. DDR4 has gone up a lot, but on a 8-channel used Xeon motherboard or whatever, you can get tolerable mem bandwidth out of it.
> Sun microsystems rack populated with three e4500
That's super cool; I bet that's a lot of fun to play around with. I wonder how much of this stuff just ended up in a landfill because it was too much effort to find buyers.