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

AMD and Jedec are working together on new Mrdimms. These multi-ranked buffered DIMMs are designed to double memory bandwidth 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 primarily intended to increase memory bandwidth in servers. Mrdimm achieves that by essentially combining two DDR ranks into a single one QDR. This doubles the data rate to the host compared to a single DDR5 module. Effectively, for example, this means 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 8800 megatransfers per second. The second generation should increase that to 12,800MT/s. Generation three should enable memory speeds of 17,600MT/s. However, such a third generation is not expected to appear until after 2030.

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

Source: Robert Hormuth through LinkedIn