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Green Samsung DDR4 server memory module with black chips and gold contacts

SAMSUNG

SAMSUNG M391A2K43BB1-CPB 16GB DDR4-2133 ECC CL15 Server RAM

SKU CH-B6FS-T5ANB

16 GB DDR4-2133 ECC server memory module with CL15 latency and 1.2 V operation

  • Total capacity16 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Memory rank2Rx8
  • ECC protection guards data integrity in servers
  • DDR4 2133 speed delivers 17000 MT/s bandwidth
  • CL15 latency keeps response times low
  • 2V operation reduces power draw per module
  • 288-pin dual-rank design fits standard server slots

Samsung DDR4-2133 ECC Server Memory

This 16 GB DDR4 module operates at 2133 MT/s with a CAS latency of CL15. It is built for servers and workstations that require error-correcting code memory for data integrity. The dual-rank 2Rx8 organisation uses Samsung chips on a 288-pin UDIMM. It suits administrators upgrading or repairing compatible DDR4 platforms.

Thermals and Power Draw

The module runs at the standard DDR4 voltage of 1.20 V, keeping power consumption low in normal server operation. As an unbuffered DIMM without a register, it presents a lighter electrical load per channel than registered alternatives. Passive cooling via chassis airflow is sufficient; no active cooling or heatsink is included or required for typical use.

What the ECC and Rank Change

On-board ECC detects and corrects single-bit errors, reducing the risk of silent data corruption in critical workloads. The dual-rank 2Rx8 layout allows the memory controller to interleave accesses across ranks, which can improve bandwidth utilisation on supported platforms. Buyers who need registered DIMMs or higher capacities per module should verify platform requirements before purchase.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $120.99
Cheaper than about 61% of the 6,523 comparable items (median $188.99).
Total capacity 16 GB
Lower than about 60% of the 6,064 comparable items (median 32 GB).
Price per GB $7.56 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

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Specifications

Product
Brand nameSAMSUNG
Model nameM391A2K43BB1-CPB
Total capacity16 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL15
ECC supportYes
Memory rank2Rx8
Power
Rated voltage1.2 V

Questions about this item

How do I install this 288-pin DDR4 module and what step is often missed?

Align the notch on the 288-pin edge connector with the slot key, press down firmly until both retention clips click, then verify the system registers 16GB at DDR4 2133 in BIOS.

What maintenance or replacement will this 2Rx8 ECC module need over time?

No routine maintenance is required; if a correctable error count rises or the module fails memtest, replace the 16GB stick with an identical 2Rx8 CL15 part.

What limit appears first when this CL15 1.20V kit runs sustained workloads?

The CL15 timing at 1.20V sets the latency floor; sustained throughput is capped by the DDR4 2133 bus before thermal throttling becomes a factor.

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