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Was that the case before Ryzen? I know their new CPUs support ECC, but I'm not sure for earlier generations.

I think it was common for AM3 for example too.

ECC is officially supported by all AM2/3(+) CPUs and AFAIK all corresponding motherboards from ASUS. As in, you have it guaranteed on the spec sheet.

There are also reports of BIOS support in some boards which don't have ECC advertised. And you can try to enable it in the OS even without BIOS support, though some level of hardware support is still necessary. As Linux documentation puts it: "may cause unknown side effects" :)

It was technically supported by the hardware, but not by many motherboard and BIOS's.

Yep.

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