Specifications
Part Number
M321RAJA0MB2-CCP
Related ordering form
M321RAJA0MB0-CCP
Capacity
128 GB
Speed
DDR5-6400 MT/s (PC5-51200)
DIMM Type
ECC Registered (RDIMM)
Rank & Organization
2Rx4
Pins
288-pin
Voltage
1.1 V
JEDEC Spec
PC5-51200R
ECC
Yes
PMIC
On-module PMIC (DDR5)
Module Height
Standard
Target Platform
8- and 12-channel DDR5 servers
Availability
Production — distributor listings carry four- to five-day lead times
Overview
The Samsung M321RAJA0MB2-CCP is a 128 GB DDR5-6400 ECC Registered DIMM in a 2Rx4 organisation - the standard density/rank point for populating current server DIMM slots to 1 TB and beyond per socket.
Samsung's D-die based DDR5 RDIMMs are the volume counterpart to its HBM line, and they share the same production economics: HBM consumes roughly three times the wafer per unit of capacity of DDR5, so HBM allocation decisions directly tighten DDR5 RDIMM supply. For buyers, that makes sourcing this specific density tier a supply question as much as a technical one.
The part pairs with any 8- or 12-channel DDR5 platform - Intel Xeon 6 (6500P / 6700P / 6900P) and AMD EPYC 9004/9005 - at 1 DIMM per channel. A sibling ordering form M321RAJA0MB0-CCP is listed alongside it by distributors.
Key Benefits
128 GB 2Rx4 — the density tier that carries 1 TB+ per socket. DDR5-6400 — 1-DPC speed for current server platforms. Registered ECC — full-rank loading with error correction. Widely qualified — Samsung RDIMMs are first-pass validated on major OEM platforms.
Applications
AI inference and training host memory, in-memory databases, virtualisation and cloud hosts, real-time analytics, and HPC nodes requiring large per-socket memory footprints.
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