Micron Shows Off 512GB DDR5 Rdimm: 12TB per Dual-Socket Server at 9,200 MT/S

Micron has demonstrated a 512GB DDR5 RDIMM rated to 9,200 MT/s, claiming the industry’s first module at that capacity and speed and reporting validation by both AMD and Intel for their next-generation server platforms. The module reaches 512GB by vertically stacking DRAM dies inside each package and using through-silicon vias (TSVs) - the same die-stacking technique used in HBM - which increases per-slot capacity without changing DIMM form factor. In a typical 24-slot dual-socket server this enables 12TB of main memory behind two CPUs, pushing memory density and bandwidth beyond current DDR5-6400 limits and targeting workloads that need larger in-memory datasets without redesigning server chassis or increasing DIMM counts.

Micron quantifies power and performance benefits: a single 512GB RDIMM consumes 16 W versus 44.2 W for four 128GB RDIMMs of equal capacity (about a 63.8% reduction, ~31 mW/GB versus ~86 mW/GB). Performance claims include up to 1.4x higher throughput on memory-bound analytics (Spark SVM) compared with 256GB DDR5 configurations, plus improved concurrency for databases and caches such as RocksDB and Redis. Enterprise use cases targeted are in-memory databases, denser virtualization, and CPU-side inference for LLMs. Volume production is scheduled for the second half of 2027, aligning with recent DRAM fab investments that will scale available wafer capacity into 2028.