It's not "unofficial" support, it's just the motherboards/OEMs don't bother to implement it or implement it in an opaque way. All the motherboards have to do to

It's not "unofficial" support, it's just the motherboards/OEMs don't bother to implement it or implement it in an opaque way. All the motherboards have to do to support this properly is have the extra RAM traces and an easy setup menu info line that tells you whether ECC is on or not. The CPU supports it fine. If you run Linux, you can use dmidecode and the EDAC driver to confirm if you have ECC enabled.