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Four green DDR5 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM 256GB (4x64GB) DDR5 4800 CL40 ECC RDIMM Lenovo Thinkstation PX memory upgrade

SKU CH-GY8J-M3HHF

256 GB DDR5 kit of four 64 GB registered ECC RDIMMs running at 4800 MT/s CL40 for Lenovo ThinkStation PX workstations

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity across four 64 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400 bandwidth
  • ECC registered RDIMM design detects and corrects data errors
  • Low 1.1 V operating voltage reduces power draw
  • Validated for Lenovo ThinkStation PX workstation compatibility

System-specific DDR5 kit

This NEMIX RAM kit delivers 256GB of DDR5 memory across four 64GB modules. It is built for Lenovo ThinkStation PX workstations that require registered ECC memory. The modules run at 4800MT/s with CL40 latency at 1.1V.

Registered ECC for multi-socket platforms

Each module is a 288-pin RDIMM with a 2Rx4 organisation, providing the signal buffering and error correction that multi-processor workstation boards demand. The registered design reduces electrical load on the memory controller, allowing the full four-module population without additional buffering hardware. No heat spreaders are fitted, so airflow in the chassis must be sufficient for bare modules.

256GB capacity for large datasets

The 256GB total suits memory-intensive workloads such as in-memory databases, virtualisation hosts and large-scale simulation. Headroom ends when the workstation's maximum supported memory per processor is reached or when the application working set exceeds the installed capacity, at which point paging to storage becomes necessary.

How it compares

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

Price $6,539.99
Pricier than about 82% 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 $25.55 per GB
Pricier than about 70% 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 numberMR38400-924K4
Total capacity256 GB (4 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo
In the box
Included items256 GB (4 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Will the CL40 latency become a bottleneck during long rendering jobs?

CL40 is the rated CAS latency at DDR5 4800; the modules run at 1.10 V and include ECC for error correction, so sustained throughput stays consistent under load.

How much heat do four 64 GB registered DIMMs produce in a closed chassis?

Each 2Rx4 RDIMM operates at 1.10 V without a heat spreader; registered buffering reduces electrical load on the memory controller, keeping thermals manageable in a ThinkStation PX airflow path.

Does the ThinkStation PX need a specific BIOS revision or CPU stepping to recognise this 256 GB kit?

The kit is validated for the Lenovo ThinkStation PX series; install the four 288-pin DDR5 RDIMMs into the workstation's memory slots and the system will detect the 256 GB capacity at 4800 MT/s.

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