Micron’s 512GB DDR5 RDIMM Targets Late-2027 Volume Production
Micron has demonstrated a 512GB DDR5 registered DIMM across multiple server platforms and says it expects volume production in the second half of 2027. The module doubles density relative to a 256GB RDIMM, but the economically useful claim is narrower than "doubling server memory capacity": actual server capacity depends on platform slot count and configuration.
Micron says the new module can run at up to 9,200 megatransfers per second and enables as much as 12TB of DDR5 in a 24-slot dual-socket server. AMD and Intel are validating the part. The company also says the 512GB module uses more than 60% less operating power than four 128GB RDIMMs delivering the same aggregate capacity.
Those gains matter for CPU-heavy inference, retrieval systems, databases and memory-bound high-performance computing. In a validated 24-slot platform, moving from 256GB to 512GB modules raises the theoretical host-memory ceiling from 6TB to 12TB without adding DIMM slots. For workloads constrained by host-memory capacity, that can delay the need to add servers solely to obtain more memory. More capacity per slot can also reduce the number of modules required for a given memory footprint and free power and physical space inside a server.
The bandwidth hierarchy remains separate. AI accelerators use high-bandwidth memory because they need enormous data throughput close to the compute engine. Increasing DDR5 capacity around the host CPU does not turn RDIMM memory into HBM or remove an accelerator's bandwidth constraint.
Micron's own product roadmap makes that distinction visible. It is shipping HBM4 and developing HBM4E for volume production in 2027 while expanding high-capacity DDR5 for the host-memory layer. The two products address different bottlenecks in the same AI server.
Micron has now put the late-2027 production ramp on the record. The 512GB RDIMM expands conventional memory density around next-generation CPUs and accelerators; it does not change the bandwidth economics that keep HBM a separate, accelerator-side market.