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Two green DDR4 ECC RDIMM sticks, 288-pin, silver heatsinks

A-Tech

A-Tech 256GB (2x128GB) DDR4 2666 ECC RDIMM 2S4Rx4 288-Pin Server RAM

SKU CH-7W51-VT2YA

A dual-channel kit of two 128 GB DDR4 2666 ECC registered DIMMs for servers and workstations

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered

Capacity 256GB (2 x 128GB)

  • 256 GB kit expands server capacity for heavy workloads
  • 2 × 128 GB modules enable dual-channel throughput
  • DDR4 2666 MHz CL19 delivers fast registered performance
  • ECC RDIMM with 2S4Rx4 3DS/TSV ensures data integrity
  • 20 V standard voltage keeps power draw low

Capacity and Kit Configuration

This 256GB kit contains two 128GB DDR4 modules built for registered ECC server platforms. The dual-channel pair delivers 256GB total capacity at 2666 MHz with CL19 latency. Each module uses a 2S4Rx4 octal-rank 3DS layout on a standard 288-pin DIMM.

Target Platform and Exclusions

The memory is designed for DDR4 servers and workstations that require registered ECC RDIMMs. It will not work in desktop or laptop systems that use unbuffered non-ECC DIMMs. Buyers needing unregistered memory for consumer platforms should select a different kit.

Decisive Specification

The registered ECC RDIMM interface with 2S4Rx4 3DS organisation is the single factor that determines compatibility. Only systems qualified for octal-rank registered DDR4 2666 modules at 1.2V can use this kit.

How it compares

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

Price $1,117.99
Pricier than about 81% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $4.37 per GB
Cheaper than about 78% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineA-Tech DDR4 Server Memory RAM
Model nameA-Tech 128 GB 2S4Rx4 PC4-2666 V-R
Total capacity256 GB (2 × 128 GB)
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2S4Rx4 (8Rx4 3DS/TSV)
Kit configurationDual Channel Kit
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Will the 2S4Rx4 octal-rank modules need any firmware updates or special seating as they age?

The modules are tested and validated at the factory; no firmware updates are required and standard 288-pin DIMM seating applies.

Does the CL19 latency at 2666 MHz become the bottleneck before bandwidth runs out?

CL19 at 2666 MHz delivers the rated PC4-21300 bandwidth; the memory controller will hit its transfer ceiling before CAS latency limits throughput.

How much extra heat do the 1.2 V registered DIMMs add when the server runs continuously?

Each module operates at the standard 1.2 V DDR4 voltage, so thermal output matches typical registered DDR4 DIMMs under sustained load.

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