Score:0

ECC DDR5: EC8 (80-bit) vs EC4 (72-bit) data integrity capabilities?

jp flag

I have been looking info about ECC on DDR5 DIMMs (full ECC, non on-die ECC) and I have seen that there are two different types:

  1. EC4, which uses 4 ECC bits per subchannel, for a total of 72 bits width
  2. EC8, which uses 8 ECC bits per subchannel, for a total of 80 bits width

One difference is that EC4 seems to be used for UDIMMs and EC8 for RDIMMs, but what I really want to know and I can't find it's the difference on data integrity between both of them. It's EC4 considered "full" ECC and SECDED?

DDR4 uses only an EC8 model with a total of 72 bits, is this equivalent to DDR5 EC4 72-bits or to EC8 80-bits when we talk about data integrity and error correction?

I sit in a Tesla and translated this thread with Ai:

mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.