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Green circuit board with black memory chips and gold edge connectors

A-Tech

A-Tech 16GB DDR4 2400 ECC UDIMM 2Rx8 Server Memory

SKU CH-D690-K40YR

16 GB DDR4 2400 ECC unbuffered DIMM with 2Rx8 organisation for server and workstation upgrades

  • Total capacity16 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • 16 GB DDR4 2400 ECC UDIMM for server workloads
  • CL17 latency at 1.2 V for efficient operation
  • 2Rx8 dual-rank layout increases memory density
  • 288-pin DIMM fits standard DDR4 server slots
  • Major-brand chips tested for reliable ECC performance

Server ECC UDIMM 16GB

This A-Tech module provides 16GB of DDR4 2400 ECC unbuffered memory for servers and workstations. It operates at 1.20V with CL17 latency and uses a 2Rx8 rank configuration on a 288-pin DIMM. Error-correcting code protects data integrity in critical workloads.

Replaces Samsung M391A2K43BB1-CRC

The module is a compatible equivalent for the Samsung M391A2K43BB1-CRC part number. Upgrading is worth it when your system requires ECC UDIMM DDR4 2400 memory and you need to add capacity or replace a failed stick. Verify your platform supports unbuffered ECC before purchasing.

Suits ECC workstation builds

This memory suits administrators expanding RAM in compatible servers or workstations that use DDR4 2400 ECC UDIMM modules. Builders needing registered DIMMs, higher speeds, or non-ECC consumer memory should look at other products. Systems limited to lower voltages or different form factors cannot use this module.

How it compares

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

Price $115.99
Cheaper than about 63% 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 $7.25 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

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Specifications

Product
Brand nameA-Tech
Total capacity16 GB
Performance
Rated speedDDR4 2400 (PC4 19200)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL17
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Power
Rated voltage1.2 V

Questions about this item

Will this 288-pin DDR4 UDIMM fit my server motherboard?

The module uses the standard 288-pin DDR4 DIMM form factor and requires a motherboard slot that supports unbuffered ECC DDR4 at 1.2 V.

What is the correct way to seat this ECC UDIMM so it posts on first boot?

Align the notch with the slot key, press down firmly until both side latches click, and ensure the system BIOS is set to the module's 2400 MHz speed and CL17 latency.

When should I plan to replace this 16 GB DDR4 module?

DDR4 memory has no moving parts; replacement is only needed if a memory test reports errors or the server's workload outgrows the 16 GB capacity.

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