We are talking about errors happening in user space applications with ECC operating normally and what the application ultimately sees.

My point is that when writing an app you wouldn’t be able to “not use” ECC accidentally or easily if it’s there. It’s just seamless. I’m not talking about special test modes or accessing stuff differently on purpose.

Interesting that DDR5 is different than DDR4. 8 bits for 32 is doubling of 8 for 64 so it must have been warranted.