AMD and Jedec are working on Mrdimm memory standard with speeds of up to 17,600MT/s

AMD and Jedec are working together on new Mrdimms. These multi-ranked buffered DIMMs are intended to double the bandwidth of memory by combining two DDR ranks. The two parties expect speeds of up to 17,600MT/s in the long term.

Jedec and AMD presented the Mrdimm standard at MemCon 2023, writes a vice president of AMD’s data center group on LinkedIn. The standard is mainly intended to increase memory bandwidth in servers. Mrdimm achieves this by essentially combining two GDR ranks into a single one QDR. This doubles the data rate to the host compared to a single DDR5 module. Effectively, this means, for example, that two DDR5 DIMMs of 4400 megatransfers per second can be combined into a single module of 8800MT/s. The design allows simultaneous access to both memory ranks.

According to the two companies, the first generation can achieve speeds of up to 8,800 megatransfers per second. The second generation should increase this to 12,800MT/s. Generation three should enable memory speeds of 17,600MT/s. However, it is expected that such a third generation will only appear after 2030.

Intel presented earlier an MCR-Rdimm memory standard which uses a similar principle for higher data rates. That should appear soon. The CPU manufacturer recently showed its Xeon Granite Rapids CPUs with DDR5-8000-MCR-Rdimms at 8000MT/s. Those processors are planned for 2024.

Source: Robert Hormuth via LinkedIn