M391A4G43MB1-CTD Samsung 32GB DDR4-2666 ECC UDIMM
M391A4G43MB1-CTD is a 32GB DDR4-2666 unbuffered ECC UDIMM manufactured by Samsung. This 288-pin memory module provides PC4-21333E performance for compatible systems that support DDR4 ECC UDIMM memory.
The module operates at 2666 MT/s with CL19 latency, 19-19-19 primary timings and the standard DDR4 voltage of 1.2V. Its dual-rank 2Rx8 organization supports reliable operation in compatible systems. Each quantity ordered includes one 32GB memory module.
Key Features
- 32GB DDR4 memory capacity
- DDR4-2666 data rate
- PC4-21333E industry designation
- 288-pin ECC UDIMM form factor
- Unbuffered ECC architecture
- Dual-rank 2Rx8 organization
- CL19 CAS latency
- 19-19-19 primary timings
- 1.2V standard DDR4 operation
- 21.3 GB/s theoretical bandwidth
- Manufactured by Samsung
- One module per quantity ordered
Common Applications
- Entry-level and tower servers
- Workstations that support ECC UDIMMs
- Network-attached storage (NAS) systems
- Industrial and embedded computers
- Replacement of an identical Samsung module
Is M391A4G43MB1-CTD Compatible With My System?
Before ordering, verify that the server, workstation or embedded system supports 288-pin DDR4 unbuffered ECC UDIMM memory. The system must also support 32GB module capacities and dual-rank 2Rx8 organization.
This module is not interchangeable with DDR3 or DDR5 memory, registered RDIMM, load-reduced LRDIMM or laptop SODIMM memory. The module may operate below 2666 MT/s when limited by the processor, motherboard or installed-memory configuration.
M391A4G43MB1-CTD Specifications
Capacity | 32GB |
Memory Type | DDR4 |
ECC | ECC |
DIMM Type | UDIMM |
Rank | 2Rx8 |
Speed | 2666 |
Voltage | 1.2V |
Height | STD |
Depth | 4G |
Width | 72 |
Pins | 288-pin |
Frequency | 1333 |
Temperature | Commercial Temp. 0°C - 85°C |
Module Name | PC4-21333U-E |
Made By | Samsung |
Need Help Confirming Compatibility?
Compare the complete part number and specifications with your existing module or system documentation. For help selecting compatible memory, contact AMP before ordering.








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