My only objection to on-die ECC is that, AFAIK, there's no way to query the number of internal corrections that have occurred. That is important information! Ye

My only objection to on-die ECC is that, AFAIK, there's no way to query the number of internal corrections that have occurred. That is important information! Yes, it might freak out some sysadmins that frequent corrected errors are now "normal" (after all, the main reason for on-die ECC is that manufacturers won't have to scrap slightly imperfect DRAM), but those individuals can be re-educated, and I really want to be able to tell if a given module is running within spec yet right at the edge of failure.