> There are AMD Motherboards that take ECC memory, but we've never seen them act on ECC errors that were uncorrectable (the correctably errors are handled, but uncorrectable errors aren't reported!).

That's incorrect. Uncorrectable errors are properly reported to the OS. Wendell from Level One Techs has tested this: https://www.reddit.com/r/Amd/comments/b1qmgy/ars_technica_th...