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Green circuit board with black memory chips, gold edge connector, no heat spreader

NEMIX RAM

NEMIX RAM 128GB DDR5 4800 ECC RDIMM 4Rx4 CL40 1.1V Lenovo 4X77A81443 memory upgrade

SKU CH-P2WD-YV7VZ

128GB DDR5 4800 ECC registered DIMM with CL40 latency and 1.1V operation for Lenovo ThinkSystem servers

  • Total capacity128 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128 GB capacity expands server memory headroom
  • DDR5 4800 speed delivers high data throughput
  • ECC registered design protects data integrity
  • 1 V operation reduces power draw
  • 288-pin RDIMM fits Lenovo ThinkSystem 4X77A81443

Capacity and Compatibility

This NEMIX RAM module delivers 128GB of DDR5 4800 memory in a single 288-pin ECC RDIMM. It is built for Lenovo ThinkSystem servers running AMD processors and carries part number 4X77A81443 for direct system matching.

Upgrade Path and Use Case

The registered 4Rx4 design with CL40 timing and 1.10V operation targets enterprise workloads that demand error correction and high density. It replaces lower-capacity RDIMMs when memory bandwidth and capacity limits become bottlenecks for virtualization or database tasks.

Installation and Common Issues

Installation follows standard DIMM slot procedure for compatible Lenovo platforms. Mismatched ranks, mixed voltages, or population rules that violate the server memory configurator are the typical causes of boot failure or reduced performance.

How it compares

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

Price $3,997.99
Pricier than about 76% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $31.23 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 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K1
Total capacity128 GB
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo
In the box
Included items128 GB (1 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Will the 288-pin DDR5 RDIMM fit my Lenovo ThinkSystem server's memory slots?

Yes, the module uses the standard 288-pin DDR5 RDIMM form factor designed for compatible Lenovo ThinkSystem servers.

Do I need to configure anything in the BIOS after installing this 4Rx4 registered ECC module?

The registered ECC RDIMM is typically detected automatically; just ensure the module is fully seated until the retention clips click.

Does the lack of a heat spreader on this 128GB module affect long-term reliability?

The module operates at the standard 1.1V DDR5 voltage and is stress-tested for server workloads without a spreader.

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