I have one of these ASRock Rack servers, and I can confirm ECC works on it - I have 128GB of ECC DDR5 with a Ryzen 9 7900.
I wish more motherboards bothered to validate ECC working - it's a nice benefit in an affordable platform.
I wish more motherboards bothered to validate ECC working - it's a nice benefit in an affordable platform.
"It works" as in it boots, or "it works" as in it checks and reports single-bit errors and reports double-bit errors?
What OS? If Linux, are you using rasdaemon? Does it confirm that the appropriate EDAC drivers are loaded and working?
Or is that data only available in the BMC's event log?
For Linux support you need a very recent kernel - I forget how recent, but some reporting on it: https://www.phoronix.com/news/AMD-EDAC-Ryzen-7000-Series
The new Asrock Ryzen 7xxx motherboards unfortunately don't have that same ECC support.