AFAIK, row refresh is done within each memory chip, while the ECC bits are normally on a separate chip (for instance, where a non-ECC module has 8 chips, an ECC

AFAIK, row refresh is done within each memory chip, while the ECC bits are normally on a separate chip (for instance, where a non-ECC module has 8 chips, an ECC modules has 9 chips), so ECC scrubbing has to be done in the memory controller.