M321RAGA0B20-CWKZH | Samsung 128GB 4800MHz DDR5 PC5-38400 ECC Registered CL40 288-Pin DIMM 1.1V Quad Rank x4 Memory Module

The Samsung M321RAGA0B20-CWKZH is a 128GB DDR5 ECC Registered DIMM (RDIMM) designed for high-end enterprise servers and modern data center environments. It is widely used in systems such as HPE ProLiant Gen10+/Gen11, Dell PowerEdge 16G series, Lenovo ThinkSystem, and other platforms based on Intel Xeon Scalable (4th/5th Gen) and AMD EPYC processors.

This module belongs to Samsung’s high-density DDR5 server memory family, built to deliver maximum memory capacity, high bandwidth, and improved power efficiency for demanding workloads such as virtualization, cloud infrastructure, AI/ML processing, in-memory databases, and high-performance computing (HPC).

It operates at DDR5-4800 MT/s (PC5-38400R) and uses ECC (Error-Correcting Code) technology to automatically detect and correct memory errors, ensuring data integrity and system stability in mission-critical enterprise environments.

Specification Details Manufacturer Samsung Part Number M321RAGA0B20-CWKZH Product Type DDR5 SDRAM ECC Registered DIMM (RDIMM) Capacity 128 GB Memory Type DDR5 Speed DDR5-4800 MT/s PC Rating PC5-38400R CAS Latency CL40 Voltage 1.1V Form Factor 288-pin DIMM Buffered Type Registered (RDIMM) ECC Support Yes (system ECC + on-die ECC) Rank Configuration 4Rx4 (Quad Rank) DRAM Organization x4-based DDR5 ICs Advanced Technology 3D Stacked DRAM (3DS) Bandwidth ~38.4 GB/s Module Type Server Memory Module Memory Architecture Registered buffering + PMIC Power Management On-module PMIC (DDR5 feature) Internal Banks 32 banks (DDR5 architecture) Burst Length 16 (BL16) Operating Temperature 0°C – 95°C Error Handling ECC single-bit correction / multi-bit detection Target Systems HPE Gen10+/Gen11, Dell PowerEdge 16G+, Lenovo ThinkSystem Typical Platforms Intel Xeon Scalable Gen4/Gen5 servers