AMD made clear at Memcon 2023 that it is fully committed to the JEDEC MRDIMM DDR5 memory standard, which will enable bandwidth to significantly increase for upcoming data centres. In the presentation, a working method for doubling data rate using DDR5 Buffered DIMMs was demonstrated.
The idea behind MRDIMM DDR5 is to combine two DDR5 DIMMs operating at 4400 MB/s speed to effectively double the data rate to the host by allowing simultaneous access to both ranks.
This procedure combines two DDRs (DDR5 DIMMs) into a single QDR with 8800 MB/s speeds by using DIMM modules with a specialised data bugger/mux. It is made clear that this method holds promise for resolving native DRAM speed scaling issues.
But the MRDIMM DDR5, also known as Multi-Ranked Buffered DIMMs, which make use of DDR5 DRAM, is also mentioned as a genuine next-generation solution. The MRDIMM DDR5 will make use of a DDR5 supply chain that is already in place and backwards and laterally compatible.
The DRAM Scaling roadmap indicates that after DDR5-6400 DIMMs, JEDEC and its partners expect the utilisation of 1st Gen MRDIMM DDR5 modules that are rated at up to 8800 MB/s out of the box. The need for DDR6 DRAM for MRDIMMs is still unclear due to their value proposition as it is still early.
This solution’s second generation is rumoured to provide 12,800 MB/s speeds, while the third generation, which is anticipated to arrive in 2030, will provide up to 17,600 MB/s speeds. However, it will be years before we get to see those in use. The official JEDEC standard had DDR5 peaking at around 8400 MB/s transfer speeds, which is more than double for the RDIMM memory.
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