I've got an ASRock AB350 Pro4 with a 1800X-CPU and 16GB ECC RAM.
Under Linux "dmesg | grep -i edac" shows OS-support for ECC.
And under Windows "wmic memphysical get memoryerrorcorrection" gives "6", i.e. Windows supports ECC on this platform.
AFAIK all ASRock AM4/TR4-boards support ECC with...
Hardware Canucks is focused in-depth reviews of the the latest graphics cards, CPUs, storage, smartphones, notebooks and gaming peripherals. Join us as we unbox, review and benchmark the best computer hardware on the market.