SAMSUNG M391B5673EH1-CH9 Server RAM Memory Module

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The SAMSUNG M391B5673EH1-CH9 is a 2 GB DDR3 ECC memory module designed for industrial PCs, servers and workstation platforms used in CNC and industrial automation environments. It provides stable system memory for PC-based CNC controls, HMIs, SCADA systems, data acquisition computers and engineering workstations.

This module uses DDR3 1333 MHz technology with a PC3-10700 specification, ECC error correction and an unbuffered UDIMM architecture. It features a 240-pin format, 2Rx8 organization, CL9 latency and operates at 1.5 V.

The ECC functionality helps detect and correct certain memory errors, improving system stability in industrial environments where continuous operation and reliable data processing are important. The module is particularly suitable for legacy industrial PCs and CNC computers requiring compatible DDR3 memory.

The M391B5673EH1-CH9 can be used as a replacement unit, spare part or CNC replacement component for compatible systems experiencing memory errors, instability or insufficient RAM capacity. Before installation, the motherboard compatibility, memory type, ECC support, capacity and operating voltage should be verified.

Each module can be tested using appropriate hardware and memory diagnostic equipment to verify capacity, ECC functionality and memory stability. It is therefore a practical solution for maintenance, retrofit and emergency replacement of legacy industrial computer systems.

Frequently asked questions about M391B5673EH1-CH9:

Is this module ECC and can it be mixed with non-ECC memory?
It is an ECC module. Most platforms require running all slots as either ECC or non-ECC, so mixing is generally not supported. Use a matched ECC set per channel for best results.

Is it UDIMM or RDIMM and why does that matter?
This reference is used as an ECC UDIMM in compatible boards. Systems designed for RDIMM will not accept UDIMM and vice versa, so always match the motherboard specification.

Will it operate at lower memory speeds if the motherboard does not support 1333 MT/s?
Yes, most controllers will downclock to the highest common DDR3 speed supported by the platform, for example 1066 MT/s. The module negotiates timing within JEDEC guidelines.

Can it be installed in a regular desktop PC?
Only if the desktop motherboard supports ECC UDIMM. Many consumer boards do not enable ECC functions, so check the board manual or QVL before purchase.