Samsung M391A2K43BB1-CPB 16GB DDR4-2133 ECC Un-Buffer LP Server Memory

The Samsung M391A2K43BB1-CPB is a 16GB DDR4-2133 ECC unbuffered low-profile server memory module for compatible servers that need an ECC memory upgrade or replacement.

Recommended For

• Operators of DDR4 ECC-UDIMM servers or home-lab systems whose motherboard and processor explicitly support 16GB dual-rank ECC UDIMMs; the module is a 16GB DDR4-2133 ECC unbuffered DIMM.
• Workstation or server users who need ECC memory for supported computing workloads and are upgrading a system that accepts DDR4 ECC UDIMMs—not registered DIMMs.
• Maintainers replacing a matching 16GB Samsung M391A2K43BB1-CPB stick in a compatible DDR4 system, especially when they want to match its capacity, speed, ECC type, and rank configuration.
• Builders of older DDR4 servers or workstations whose board supports 2133 MT/s ECC UDIMMs and needs a single 16GB module; compatible systems may run memory at a lower speed if required by their platform.

Real-World Use Scenarios

• When adding memory to a compatible TrueNAS or ZFS storage server, this 16GB ECC module can provide more room for file services and caching while adding protection against certain correctable memory errors, if the system enables ECC. It does not replace backups or other data-protection measures.
• For a small home-lab server running containers and a few lightweight virtual machines, adding this DIMM increases the memory available to the host and its workloads. The practical benefit depends on the system’s existing RAM, VM allocations, and motherboard support.
• When expanding a compatible Supermicro server, users can add 16GB of memory with a module Supermicro lists as validated for specific motherboards. Check the board’s supported memory type, population rules, and maximum capacity before installing it.
• When replacing a failed or mismatched DIMM in an ECC-UDIMM server, this module can restore or expand memory capacity if it matches the platform’s requirements. It is unbuffered ECC memory, so it is not a substitute for registered ECC DIMMs in systems that require registered memory.

Spec Summary