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Green circuit board with black memory chips and gold edge connectors

A-Tech

A-Tech 4GB DDR4 2133 ECC UDIMM 1Rx8 Server Memory Samsung M391A5143EB1-CPB

SKU CH-RYT9-2DE51

4 GB DDR4 2133 ECC unbuffered DIMM with CL15 latency and 1.2 V operation for server and workstation upgrades

  • Total capacity4 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • 4GB capacity expands server multitasking headroom
  • DDR4 2133 speed handles data-intensive workloads
  • ECC UDIMM protects critical data integrity
  • 1Rx8 single-rank layout ensures broad compatibility
  • 2V operation reduces system power draw

Server memory for ECC workloads

This 4 GB DDR4 2133 module is built for servers and workstations that require error-correcting unbuffered DIMMs. It runs at the standard 1.2 V with CL15 timing and uses a single-rank 1Rx8 layout. The 288-pin form factor fits DDR4 slots that accept ECC UDIMMs.

Suited for single-slot upgrades

Buyers adding capacity to a compatible platform with an open DIMM slot will find this module straightforward. Systems that need registered or load-reduced memory cannot use this unbuffered stick. Builds requiring higher density per slot or speeds beyond 2133 MT/s should look at other modules.

Simple press-in installation

Align the notch with the DDR4 key, press until the latches click, and the firmware will detect the new capacity on the next boot. The most common issue is mixing this unbuffered ECC stick with registered DIMMs or populating slots in an order the board does not support, which prevents the system from posting.

How it compares

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

Price $30.99
Cheaper than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 4 GB
Lower than about 95% of the 6,064 comparable items (median 32 GB).
Price per GB $7.75 per GB
Pricier than about 54% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameA-Tech
Total capacity4 GB
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL15
ECC supportYes
Buffer typeUnbuffered
Memory rank1Rx8
Power
Rated voltage1.2 V

Questions about this item

Does my motherboard need DDR4 288-pin slots for this module?

Yes, this is a DDR4 UDIMM with a 288-pin form factor, so the board must provide DDR4 DIMM slots that accept unbuffered ECC memory.

Can I add this CL15 1.20 V stick to a system already running CL15 1.20 V DDR4 2133 ECC UDIMMs?

Mixing modules with identical speed, voltage, CAS latency, rank and ECC type usually works, but the motherboard will run all sticks at the slowest common settings.

How can I confirm the module is detected as 4 GB ECC at 2133 MT/s after installation?

Enter the BIOS or UEFI and check the memory information screen; it should show 4 GB, ECC enabled, and a data rate of 2133 MT/s.

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