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Wonder if DDR5 ECC ram has the same problem? I'm meaning the real ECC stuff, not the "on chip only ECC" that all DDR5 has.

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.