Thanks all

I wasn't following the ETH Constantinople thing very well. Or other coins; I appreciate the links and suggestions. I follow things as much as I can outside my work and I'm quite a fanatic so I was surprised I only had vague memories of CPU minable coins in one of those links.
Yeah, 72 CPU or 128 CPU rig to begin with, one or the other, I could do 256 CPUs later if it seems worth a try. I can mine Pascal Coin since it's really only minable on CPUs, but gotta have several AMD server CPUs to justify mining there; it makes money but not quite enough to cover costs unless there's big gains in prices later. I got into these big rigs since I finished the mining part of my own Pascal Coin miner, and assembling it for testing with the latest testnet. Should be fun.