Samsung

Samsung M391A4G43BB1-CWE

Name: Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin)
Brand: Samsung
SKU: M391A4G43BB1-CWE

View on semiconductor.samsung.com

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Manufacturer: Samsung Last updated: September 11, 2026

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Samsung M391A4G43BB1-CWE Review

The Samsung M391A4G43BB1-CWE is an OEM-grade ECC UDIMM widely used as the factory-installed memory in Dell, HP, and Lenovo workstations, appealing to buyers who specifically want factory-original Samsung dies rather than a third-party rebrand.

ECC error correction in an unbuffered 32GB module built directly by Samsung, one of the three companies that actually manufacture DRAM chips, rather than a third party binning someone else's silicon. ECC UDIMMs cannot be mixed with RDIMMs. For AMD Threadripper (non-PRO), Intel Xeon W, and workstation or entry-server boards with explicit ECC UDIMM support, and as an OEM replacement part for Dell/HP/Lenovo workstations originally shipped with this exact module. Against the Crucial (Micron) MTA18ASF4G72AZ-3G2B1, covered elsewhere on this site, both are 32GB DDR4-3200 ECC UDIMMs from first-party DRAM manufacturers, with this Samsung module being the more common factory-fit part in major OEM workstations specifically. Against the Kingston Server Premier KSM32ED8/32ME, also covered elsewhere on this site, both compete at the same capacity and speed tier.

ECC and Unbuffered Operation

Compatibility

For AMD Threadripper (non-PRO), Intel Xeon W, and workstation or entry-server boards with explicit ECC UDIMM support, and as an OEM replacement part for Dell/HP/Lenovo workstations originally shipped with this exact module.

Comparison to Alternatives

Against the Crucial (Micron) MTA18ASF4G72AZ-3G2B1, covered elsewhere on this site, both are 32GB DDR4-3200 ECC UDIMMs from first-party DRAM manufacturers, with this Samsung module being the more common factory-fit part in major OEM workstations specifically. Against the Kingston Server Premier KSM32ED8/32ME, also covered elsewhere on this site, both compete at the same capacity and speed tier.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Best for

Buyers replacing or expanding memory in a Dell, HP, or Lenovo workstation that shipped with Samsung modules. This part directly matches the factory-original specification in those systems.

Not for

Not for buyers with no OEM-matching requirement who are comparing purely on price. The Kingston or Crucial equivalents, both covered elsewhere on this site, may be more competitively priced.

Specifications

What these specs mean

Identity

Peak Bandwidth	25.6 GB/s
Brand	Samsung
Series	Samsung Server/Workstation

Memory

DDR Generation	DDR4
Capacity	32 GB
Speed	3200 MT/s
CAS Latency	22
Voltage	1.2 V

Module and platform

RAM Segment	Server
Pin Count	288

Capacity

Capacity Per Module	32 GB
Module Count	1

Speed and timings

True Latency	13.8 ns

Silicon

ECC	Yes

Commercial

Warranty	Limited Lifetime

FAQs

What are the key specifications of the Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin)?

The Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin) is a memory kit from Samsung. Key specs: DDR Generation DDR4, Capacity 32GB, Kit Configuration 1 x 32GB, Pin Count 288, Speed 3200MHz.

Will the Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin) work with my current setup?

The Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin) lists DDR Generation is DDR4. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits. Our upgrade checker at /upgrade can confirm compatibility for common combinations.

Who is the Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin) best suited to?

Best suited to: Buyers replacing or expanding memory in a Dell, HP, or Lenovo workstation that shipped with Samsung modules. This part directly matches the factory-original specification in those systems.

What are the drawbacks of the Samsung M391A4G43BB1-CWE (32GB DDR4-3200 ECC UDIMM/CL22/2Rx8/1.2V/288-Pin)?

Not the best fit for: Not for buyers with no OEM-matching requirement who are comparing purely on price. The Kingston or Crucial equivalents, both covered elsewhere on this site, may be more competitively priced.