Every ryzen 3000 chip with an x570 board supports unregistered ecc. And earlier ryzens all have some support, but motherboard compatability is patchy. These are

Every ryzen 3000 chip with an x570 board supports unregistered ecc. And earlier ryzens all have some support, but motherboard compatability is patchy. These are the most popular desktop chips on the market right now, so I wouldn't call it hard to find. Not terribly well documented is fair, as I'd say the majority of the market for these chips don't want or need ecc.