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Two green 288-pin DDR5 RDIMM modules, no heat spreader

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 5600 CL46 288-pin ECC RDIMM Lenovo ThinkSystem SR780a V3 memory upgrade

SKU CH-WQ2J-S3CAR

256 GB DDR5 ECC registered server memory kit in two 128 GB modules running at 5600 MT/s CL46 for Lenovo ThinkSystem SR780a V3

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL46
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256GB kit expands server capacity for heavy workloads
  • DDR5 5600 speed delivers high bandwidth for data-intensive tasks
  • ECC registered design protects data integrity in mission-critical systems
  • 1V operation reduces power draw per module
  • Validated for Lenovo ThinkSystem SR780a V3 rack servers

System-Specific DDR5 Kit

This 256 GB kit contains two 128 GB registered DIMMs built for the Lenovo ThinkSystem SR780a V3 rack server. ECC and register circuitry protect data integrity in mission-critical workloads. The modules run at 5600 MT/s with a CAS latency of 46 at 1.10 V.

DDR5 5600 Interface Limits

The PC5-44800 standard tops out at 5600 MT/s, so this kit cannot exceed that transfer rate without a platform that officially supports higher JEDEC speeds. Registered buffering adds one cycle of command latency, which is normal for server memory. Four-rank organisation increases density but may restrict maximum population on some boards.

ECC RDIMM Build and Connectors

Each 288-pin module uses major-brand Samsung, Micron or Hynix chips without a heat spreader, relying on chassis airflow for cooling. The registered design places a buffer between the DRAM and the memory controller, reducing electrical load. Installers must match the keyed notch and populate slots in the order the server manual specifies.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $9,325.99
Pricier than about 86% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $36.43 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineLenovo Server/Workstation Compatible Series Memory
Model nameLenovo DDR5 5600 MHz ECC RDIMM Registered Server Memory
Part numberMR44800-744K2
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 5600 (PC5 44800)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL46
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo
In the box
Included items256 GB (2 × 128 GB) DDR5 5600 MHz PC5-44800 4Rx4 1.1 V CL46 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Should I choose the 256GB kit with two 128GB modules or a different capacity for my ThinkSystem SR780a V3?

This kit provides 256GB total across two 128GB RDIMMs, matching the 4Rx4 rank structure and 1.1V voltage specified for the SR780a V3 memory slots.

What does the DDR5 5600 speed rating mean for actual throughput in this server?

The PC5-44800 designation indicates a peak transfer rate of 44800 MT/s, which the memory controller will use when the platform runs at the rated 5600 frequency.

How does the 288-pin ECC RDIMM interface limit what I can install alongside this kit?

The modules are 288-pin DDR5 RDIMMs with ECC and registered buffering, so they only fit DDR5 RDIMM slots that support 4Rx4 organisation and 1.10V operation.

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