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Two green DDR4 server DIMMs with black heat spreaders, 288-pin, 64GB each

A-Tech

A-Tech 128GB (2x64GB) DDR4 2666 ECC RDIMM 2S2Rx4 3DS/TSV server RAM

SKU CH-GBA7-TWHVQ

A 128 GB DDR4 2666 ECC registered dual-channel kit with two 64 GB quad-rank 3DS modules running at 1.2 V and CL19 latency

  • Capacity128GB (2 x 64GB)
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCYes
  • Buffered/RegisteredRegistered

Capacity 128GB (2 x 64GB)

  • 128 GB total capacity with two 64 GB modules
  • DDR4 2666 MHz speed rated at PC4-21300
  • ECC registered design detects and corrects data errors
  • 288-pin DIMM form factor with 3DS/TSV quad-rank architecture
  • 20 V standard DDR4 voltage for efficient server operation

128GB DDR4 ECC Registered Kit

This 128GB kit consists of two 64GB DDR4 2666 MHz ECC Registered DIMMs built for servers and workstations. Each module uses a 288-pin form factor and operates at 1.2V with CL19 latency. The quad-rank 3DS/TSV design allows high density in compatible multi-processor platforms.

For DDR4 servers needing maximum capacity per slot

Suits administrators upgrading DDR4-based servers or workstations that accept 4Rx4 3DS Registered modules and require ECC error correction. Not for desktop or laptop systems, which cannot use Registered ECC DIMMs. Also unsuitable for platforms limited to single- or dual-rank memory or those without 3DS/TSV support.

128GB across two slots with 3DS headroom

The dual-channel kit delivers 128GB using only two DIMM slots, leaving additional slots free for further expansion where the motherboard and CPU memory controller allow. Capacity scales until the platform's maximum supported rank count or total memory limit is reached. Speed remains at 2666 MHz within the DDR4 2666 specification.

Highlights

  • 128 GB total capacity with two 64 GB modules
  • DDR4 2666 MHz speed rated at PC4-21300
  • ECC registered design detects and corrects data errors
  • 288-pin DIMM form factor with 3DS/TSV quad-rank architecture
  • 20 V standard DDR4 voltage for efficient server operation

Specifications

BrandA-Tech
SeriesA-Tech DDR4 Server Memory RAM
ModelA-Tech 64GB 2S2Rx4 PC4-2666V-R
Capacity128GB (2 x 64GB)
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCYes
Buffered/RegisteredRegistered
Rank2S2Rx4 (4Rx4 3DS/TSV)
Multi-channel KitDual Channel Kit
ChipsetMajor Brand Chipset
FeaturesMajor Brand Chips

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Questions about this item

Does my motherboard need 288-pin DDR4 ECC RDIMM slots to use this 128GB kit?

Yes, the kit requires a server or workstation motherboard with 288-pin DDR4 slots that support ECC Registered DIMMs. Desktop or laptop boards will not accept these modules.

Will the 2S2Rx4 quad-rank 3DS/TSV organisation work with a CPU that only supports dual-rank DDR4?

The 2S2Rx4 (4Rx4) quad-rank design uses 3DS/TSV stacking; the memory controller must explicitly support quad-rank 3DS/TSV modules. Check your platform's qualified vendor list before installing.

How can I confirm the kit is running at 2666 MT/s with CL19 after installation?

Enter the system BIOS or UEFI and verify the memory frequency shows 2666 MT/s (PC4-21300) with CAS latency 19 at 1.2 V. You can also use a hardware-info utility inside the OS to confirm the same values.

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