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Four green DDR5 RDIMM modules with gold contacts and black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 256GB (4×64GB) DDR5 5600 CL46 ECC RDIMM memory upgrade

SKU CH-6KZG-GE4EZ

A 256GB kit of four 64GB DDR5 5600 CL46 ECC registered DIMMs for the Lenovo ThinkSystem SR680a V3 server

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 5600 (PC5 44800)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL46
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity from four 64 GB modules
  • DDR5 5600 speed rated at PC5-44800
  • ECC registered RDIMM for data integrity
  • CL46 latency at 1.1 V operating voltage
  • 288-pin 2Rx4 layout built for Lenovo SR680a V3

Lenovo ThinkSystem SR680a V3 compatible kit

This 256 GB kit contains four 64 GB DDR5 5600 registered ECC RDIMM modules built for the Lenovo ThinkSystem SR680a V3 rack server. Each module runs at 1.10 V with CL46 latency and a 2Rx4 organisation. The registered design adds a buffer that helps maintain signal integrity on heavily populated server motherboards.

Thermals noise and power draw

Operating at the standard DDR5 voltage of 1.10 V keeps power draw low for a high-capacity server configuration. The modules ship without heat spreaders, relying on the server chassis airflow to manage thermals during normal operation. Registered buffering reduces electrical loading on the memory controller, contributing to stable, quiet running in typical workloads.

Sustained load behaviour

Rigorous stress testing under load is performed on every module to verify reliability for mission-critical environments. ECC protection detects and corrects single-bit errors that can accumulate during extended compute tasks. The 2Rx4 rank structure supports high density while maintaining consistent throughput across long-duration workloads.

How it compares

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

Price $8,442.99
Pricier than about 85% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $32.98 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 numberMR44800-924K4
Total capacity256 GB (4 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo
In the box
Included items256 GB (4 × 64 GB) DDR5 5600 MHz PC5-44800 2Rx4 1.1 V CL46 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How do I install the 288-pin DDR5 RDIMM modules in the Lenovo ThinkSystem SR680a V3, and what step is often missed?

Power down the server, open the chassis, locate the DIMM slots for the target CPU, align each module's key notch with the slot, press firmly until the ejector tabs click shut, then verify in BIOS that all four 64 GB modules report 5600 MT/s and ECC active.

What maintenance or replacement will the 256 GB DDR5 ECC RDIMM kit need over its service life?

No scheduled maintenance is required; the modules have no heat spreaders or moving parts. If a module fails, replace the individual 64 GB RDIMM — ECC corrects single-bit errors, but uncorrectable errors mean the stick must be swapped.

What limit appears first when the 5600 CL46 2Rx4 RDIMMs run sustained workloads?

The CAS latency of 46 cycles at 5600 MT/s sets the baseline response time; under continuous load the memory controller's thermal throttling or the 1.10 V power envelope typically caps sustained throughput before the modules themselves overheat.

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