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Green circuit board with black memory chips and gold edge connectors

A-Tech

A-Tech 8GB DDR4 2666MHz ECC UDIMM 1Rx8 for Samsung M391A1K43BB2-CTD M391A1K43DB2-CTD Server RAM

SKU CH-H053-Z1YDT

ECC UDIMM server memory, 8 GB DDR4 2666 MHz CL19, 1.20 V, 1Rx8, 288-pin, replaces Samsung M391A1K43BB2-CTD and M391A1K43DB2-CTD

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • 8 GB capacity expands server memory headroom
  • DDR4 2666 MHz speed delivers PC4-21300 bandwidth
  • ECC UDIMM design detects and corrects single-bit errors
  • 1Rx8 single-rank layout keeps electrical load low
  • 2 V standard voltage matches DDR4 platform requirements

Server DDR4 ECC UDIMM

This A-Tech module is an 8 GB DDR4 2666 MHz ECC UDIMM built for server and workstation platforms that require error-correcting unbuffered memory. It runs at the standard 1.20 V DDR4 voltage with CL19 latency and uses a single-rank 1Rx8 organisation on a 288-pin DIMM. The stick is validated as a direct replacement for Samsung M391A1K43BB2-CTD and M391A1K43DB2-CTD parts.

Buyers needing ECC UDIMM

It suits administrators upgrading or repairing systems that specifically call for DDR4 ECC unbuffered DIMMs at 2666 MHz. Builders whose platforms demand registered or load-reduced DIMMs, higher capacities per slot, or faster DDR4 speeds should look at other modules that match those requirements.

Sustained server workloads

Under continuous load the module maintains its rated 2666 MHz throughput and CL19 timings while the ECC circuitry corrects single-bit errors in real time. The 1.20 V operation keeps power draw predictable during extended compute or virtualisation tasks, and the major-brand chipset delivers consistent reliability across long duty cycles.

How it compares

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

Price $94.99
Cheaper than about 71% of the 6,523 comparable items (median $188.99).
Total capacity 8 GB
Lower than about 80% of the 6,064 comparable items (median 32 GB).
Price per GB $11.87 per GB
Pricier than about 71% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Total capacity8 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank1Rx8
Power
Rated voltage1.2 V

Questions about this item

Will my motherboard accept this 288-pin DDR4 ECC UDIMM running at 2666 MHz and 1.20 V?

The module is a 288-pin DDR4 DIMM rated for 2666 MHz at 1.20 V with CL19 latency; your board must support DDR4 ECC UDIMMs at that voltage and speed.

If I add this CL19 1Rx8 stick beside my existing CL19 1Rx8 DDR4 2666 modules, will the system run all channels at the rated speed?

Yes — matching speed, voltage, rank, ECC type and CAS latency lets the memory controller operate all populated slots at 2666 MHz without down-clocking.

After installation, how can I confirm the module is detected as 8 GB ECC at 2666 MHz with CL19 timings?

Check the BIOS memory summary or an OS tool such as dmidecode; it should report 8 GB, DDR4-2666, ECC UDIMM, 1Rx8, 1.20 V and CL19.

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