Thanks, have you run any tests to confirm it is working? I’d be more comfortable with a guarantee from the manufacturer but confirmation an ok second choice.
Yes. I originally bought this board with a 3800X and 64 GB of inexpensive non-ECC RAM. That configuration worked fine. I later upgraded to a 5950X CPU, when I needed more CPU power and cores for some software I was writing. After upgrading, I occasionally got memory errors under very heavy load, with the same memory that had been fine with the slower CPU. I upgraded to ECC memory, and it fixed all the memory errors. The memory tested correctly as ECC in all the tools I tried, and also solved an actual stability problem I was having, so I trust it.