> only a minority of them enables ECC support in their firmware, so always check for that before buying!

This is the annoying part.

That AMD permits ECC is a truly fantastic situation, but if it's supported by the motherboard is often unlikely and worse: it's not advertised even when it's available.

I have an ASUS PRIME TRX40 PRO and the tech specs say that it can run ECC and non-ECC but not if ECC will be available to the operating system, merely that the DIMMS will work.

It's much more hit and miss in reality than it should be, though this motherboard was a pricey one: one can't use price as a proxy for features.