I did some reading up on this just now. You are of course right in that ECC on-chip will only handle bitflips inside the chip. To ensure the integrity of signal

I did some reading up on this just now. You are of course right in that ECC on-chip will only handle bitflips inside the chip. To ensure the integrity of signals between the memory and the processor traditional ECC will still be required. On DDR5 it will be necessary to have 4 parity chips whereas with DDR4, you only need 2, so true ECC capable memories will be considerably expensive.