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Green rectangular 288-pin DDR4 memory module with black chips, no heat spreader

SK hynix

SK hynix HMAA8GL7AMR4N-VK 64GB DDR4-2666 PC4-21300 4Rx4 ECC Load Reduced server RAM

SKU CH-TTZY-2VMBN MPN HMAA8GL7AMR4N-VK

A 64GB DDR4-2666 PC4-21300 load-reduced ECC module with 4Rx4 organisation and CL19 latency for high-density server memory

  • Capacity64GB
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCYes
  • 64 GB capacity powers virtualization and in-memory databases
  • Load Reduced design allows more DIMMs per channel for greater density
  • ECC protection detects and corrects data errors
  • DDR4-2666 speed delivers 21300 MT/s bandwidth
  • 20 V operation reduces server power draw

Server Memory for High-Density Workloads

This 64GB DDR4 module targets servers that need maximum installed capacity per channel. It suits virtualisation hosts, in-memory databases and high-performance computing clusters where memory density matters more than raw frequency. The Load Reduced design allows more DIMMs per channel than standard registered modules. Buyers who need unbuffered desktop memory or non-ECC modules cannot use this part.

DDR4-2666 Interface Constraints

The module runs at 2666 MT/s with PC4-21300 bandwidth and CL19 latency at 1.20V. Load Reduced buffering removes the rank-per-channel ceiling that limits ordinary RDIMMs, yet the electrical load still caps how many modules a single memory controller can drive. Systems limited to lower DDR4 speeds will downclock the kit, and platforms that only accept standard RDIMMs or UDIMMs will not recognise it. Mixing with unbuffered ECC DIMMs is not supported.

4Rx4 Rank Architecture Decides Fit

The quad-rank 4Rx4 organisation is the single specification that determines compatibility. Only motherboards and CPUs qualified for Load Reduced 4Rx4 DIMMs can address the full 64GB per slot. Boards validated solely for 1Rx4, 2Rx4 or standard RDIMM ranks will not post with this module installed. Verify the platform’s qualified vendor list for 4Rx4 LRDIMM support before purchase.

Highlights

  • 64 GB capacity powers virtualization and in-memory databases
  • Load Reduced design allows more DIMMs per channel for greater density
  • ECC protection detects and corrects data errors
  • DDR4-2666 speed delivers 21300 MT/s bandwidth
  • 20 V operation reduces server power draw

Specifications

BrandSK hynix
ModelHMAA8GL7AMR4N-VK
Capacity64GB
Type288-Pin DDR4 SDRAM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
ChipsetMajor Brand Chipset
Heat SpreaderNo
FeaturesEliminate channel ranking limitations associated with standard RDIMMs
Enable more installed DIMMs per channel for greater memory density
More memory bandwidth than standard RDIMMs
More energy efficient than standard RDIMMs
100% component and module tested to mission-critical server standards
Compatible with OEM servers and warranties
Optimized for Intel Xeon processor product families

Questions about this item

Should I pick the 64 GB or 128 GB module for my server?

The module listed here is 64 GB; the 128 GB figure appears only as a maximum density supported by the platform, not as an option for this part number.

What does the PC4-21300 rating mean once the DIMM is installed?

It indicates a peak transfer rate of 21 300 MB/s at the rated DDR4 2666 MT/s speed with CL19 latency.

How does the Load Reduced interface affect real-world memory limits?

Load Reduced buffering removes the rank-per-channel bottleneck of standard RDIMMs, letting you populate more DIMMs per channel for higher total capacity.

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