The controllers which support ECC are usually a lot better and able to handle more channels. They also typically require active cooling.

Interesting. Didn't know about the active cooling requirement.

That being said, it's not hard to get a hold of a reasonably modern DDR5 EPYC board. Something like this: https://www.phoronix.com/review/gigabyte-mz33-ar1

Expensive though.