M393A2K43DB3-CWE 16GB DDR4-3200 ECC RDIMM Server Memory

M393A2K43DB3-CWE

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Introduction

The M393A2K43DB3-CWE is a 16GB DDR4-3200 ECC Registered DIMM with a 2Rx8 organization. Unlike 16GB 1Rx4 alternatives, it presents two addressable ranks and uses x8 DRAM devices, making rank layout and device width important purchasing criteria.

Its two ranks are each built as a 72-bit ECC data path using nine x8 devices. A compatible memory controller can alternate access between ranks through rank interleaving, which may improve bus utilization during sustained workloads. Actual behavior depends on the processor, BIOS, and memory population.

A published server qualification list identifies this exact model as DDR4-3200 ECC/REG with Samsung K4A8G085WD-BCWE DRAM and an IDT 4RCD0232KC1 register clock driver. These component identifiers help distinguish it from visually similar modules and support BOM-level verification.

The module operates at 1.2V in a standard 288-pin RDIMM form factor and carries a PC4-25600, CL22 classification. Its register buffers command and control signals, while ECC supports correction of common single-bit memory errors during normal server operation.

For customers sourcing this exact server-memory configuration, we at Huaying Hengtong provide product sourcing, server memory solutions, and configuration assistance for enterprise computing requirements.

M393A2K43DB3-CWE is not an automatic substitute for a 1Rx4 RDIMM with the same capacity and speed. Some servers apply different advanced memory-protection rules to x8 modules. Verify the server QVL, processor generation, BIOS level, RAS mode, rank limits, DIMMs per channel, and population symmetry before purchase.

Specifications

Product Model	M393A2K43DB3-CWE
Memory Type	DDR4
Module Type	Registered DIMM / RDIMM
Application	Server
Capacity	16GB
Memory Speed	3200 MT/s
Speed Classification	DDR4-3200 / PC4-25600
Memory Organization	2Rx8
Error Correction	ECC Supported
CAS Latency	CL22
Operating Voltage	1.2V
Form Factor	288-pin DIMM

Key Product Features

2Rx8 Dual-Rank Organization

Two independently addressable ranks are the defining feature of this model. Each rank uses nine x8 devices in a 72-bit ECC layout, allowing compatible controllers to schedule activity across ranks while following platform-specific slot and population rules.

Component-Level BOM Identification

Published validation information lists Samsung K4A8G085WD-BCWE DRAM and an IDT 4RCD0232KC1 register clock driver. These identifiers provide a stronger replacement check than capacity and speed alone when comparing labels, revisions, or available stock.

DDR4-3200 ECC Registered Operation

The module combines 16GB capacity, 3200 MT/s speed, PC4-25600 classification, CL22 timing, 1.2V operation, and a 288-pin RDIMM interface for compatible server platforms requiring registered ECC memory.

x8 Compatibility and RAS Planning

Standard ECC is supported, but advanced single-device correction or lockstep behavior can depend on the server architecture and selected memory mode. Confirm the validated DIMM list and RAS settings before mixing this 2Rx8 module with x4-based RDIMMs.

The M393A2K43DB3-CWE is best selected when a server BOM specifically requires a 16GB DDR4-3200 2Rx8 ECC RDIMM. Its dual-rank layout and documented component configuration clearly differentiate it from 1Rx4 alternatives used in other server memory designs.