Do MRDIMMs and Xeon 6 processors support chipkill ECC where one DRAM chip can fail completely and the ECC bits reconstruct the data in the one failed DRAM chip?

MRDIMM is a JEDEC standard. MRDIMMs are supported by broad memory ecosystem. Intel has taken the lead in supporting this memory technology with recently launched Xeon 6 CPUs with P-cores.

I’ve been mildly confused (too?) about this fast moving tech, but sure like the HPCG uplift from MRDIMM. In its performance comparison of MRDIMM vs DDR5, Phoronix notes that “Granite Rapids is the first platform supporting MRDIMMs” (Micron 64GB 2RX4 PC5-8800X-HA0-1110-XT modules in their tests), and so one can’t really say much about how well it does in AMD products (in real life) at this stage — though one would expect similar benefits in AMD CPUs that do support the tech ( https://www.phoronix.com/review/intel-xeon6-mrdimm-ddr5 ).

The confusing bit(s) to me is that I thought it was MCRDIMM that would befit Granite Rapids, as developed jointly by SK Hynix, Renesas, and Intel, back in December 2022 ( https://news.skhynix.com/sk-hynix-develops-mcr-dimm/ ).

Then, in April 2023 we learned that AMD and JEDEC were developing a new industry standard for DDR5 memory called MRDIMMs which had similar goals to MCRDIMM, but that might be different, incompatible, and aimed at years 2030+(?) ( https://www.techpowerup.com/306762/amd-and-jedec-create-ddr5-mrdimms-with-17-600-mt-s-speeds and https://www.tomshardware.com/news/amd-advocates-ddr5-mrdimms-with-speeds-up-to-17600-mts ).

And then, in August 2024, we learned that Micron and Intel were bringing MRDIMM modules to market right there and then ( https://www.eetimes.com/micron-intel-bring-mrdimm-modules-to-market/ ).

And now, as noted earlier, we learned last week that Granite Rapids indeed uses/supports MRDIMMs in real life, today (to great effect). This begs questions of whether there’ll eventually be a separate MCRDIMM product, if this is actually different from MRDIMM, and will Turin support MRDIMM? etc …