Memory Modules

M321R6GA0PB0-CWM

M321R6GA0PB0-CWM - 48GB DDR5-5600 ECC RDIMM | Samsung

The Samsung M321R6GA0PB0-CWM is a 48GB DDR5 ECC registered DIMM (RDIMM) operating at 5600 MT/s (PC5-44800) on a 1.1V supply, built on a 288-pin DIMM form factor for server platforms. The module is organized as 1Rx4 (6Gx72) using twenty 6Gb x4 DDR5 DRAM dies in FBGA packages with on-module registering and ECC functionality. A registered DIMM (RDIMM) is a server-class memory module that buffers address and command signals through a registering clock driver, reducing electrical load on the memory controller and enabling higher capacities and densities than unbuffered UDIMMs. RDIMMs sit within the memory module hierarchy (DRAM IC -> rank -> module -> memory subsystem) and are the standard main-memory building block for enterprise servers and workstations. Key features include 48GB single-rank capacity in a x4 configuration, 5600 Mbps data rate compliant with the JEDEC DDR5 specification, on-die ECC combined with side-band ECC for data integrity, and a low 1.1V operating voltage that reduces power per bit compared with DDR4 RDIMMs. The CWM speed bin corresponds to the 5600 MT/s mainstream server grade. Architecturally, DDR5 moves the power management from the motherboard to an on-module PMIC and doubles bank groups while halving the channel width to two independent 40-bit subchannels per DIMM. The x4 device organization combined with register-based buffering improves signal integrity at 5600 MT/s, while the on-die ECC of DDR5 DRAM corrects internal single-bit errors transparently. Typical applications include midrange rack servers, virtualization hosts running intermediate VM workloads, dense blade systems, and storage controllers, where 48GB per DIMM maximizes capacity per slot and the 5600 MT/s rate feeds modern Xeon and EPYC memory controllers. When designing a system configuration, always verify RDIMM support in the platform QVL, populate channels in matched sets, and never mix RDIMMs with LRDIMMs or UDIMMs on the same channel. This page synthesizes distributor inventory, same-slot alternatives, and practical deployment notes not found in the manufacturer datasheet.