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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

  • Capacity128GB
  • SpeedDDR5 4800 (PC5 38400)
  • ECCYes
  • Buffered/RegisteredRegistered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.10V
  • 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.

Highlights

  • 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

Specifications

BrandNEMIX RAM
SeriesLenovo Server/Workstation Compatible Series Memory
ModelLenovo DDR5 4800MHZ ECC RDIMM Registered Server Memory
Part NumberMR38400-744K1
Capacity128GB
SpeedDDR5 4800 (PC5 38400)
ECCYes
Buffered/RegisteredRegistered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.10V
Compatible SystemLenovo
CAS LatencyCL40
Heat SpreaderNo
Type288-Pin DDR5 RDIMM
Rank4Rx4
FeaturesDDR5 ECC Registered RDIMM Server Motherboard Compatible
Package Content128GB (1X128GB) DDR5 4800MHZ PC5-38400 4Rx4 1.1V 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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