We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Two green DDR5 RDIMM modules without heat spreaders, 288-pin, 256GB total

NEMIX RAM

NEMIX RAM MR38400-744K2 256GB (2x128GB) DDR5 4800 CL40 ECC RDIMM for Lenovo Thinkstation PX memory upgrade

SKU CH-76ZQ-JB2B8

DDR5 ECC registered RDIMM kit adding 256 GB across two 128 GB modules at 4800 MT/s CL40 for Lenovo ThinkStation PX workstations

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB capacity with two 128 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400
  • ECC registered design protects data integrity
  • 1 V operation reduces power draw
  • Validated for Lenovo Thinkstation PX workstations

System-specific DDR5 kit for Lenovo Thinkstation PX

This 256GB kit comprises two 128GB registered ECC RDIMMs built for the Lenovo Thinkstation PX workstation platform. It runs at DDR5 4800 with a CAS latency of CL40 and operates at 1.1V. The modules use a 288-pin 4Rx4 layout with chips sourced from major OEM suppliers.

Sustained-load behaviour with registered ECC

Registered buffering and on-die ECC maintain data integrity during continuous multi-threaded workloads such as rendering, simulation or virtualization hosting. The 4Rx4 organization allows high density per channel while the 1.10V operating voltage keeps power draw predictable under prolonged stress. Modules are stress-tested under load before shipping.

Thermals and power in normal operation

Bare modules without heat spreaders rely on chassis airflow for cooling; the low 1.1V DDR5 voltage limits thermal output during typical workstation duties. Registered design adds minimal latency overhead while reducing electrical load on the memory controller. Acoustic profile is silent as no active cooling is present on the DIMMs themselves.

How it compares

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

Price $8,229.99
Pricier than about 85% 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 $32.15 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineLenovo Server/Workstation Compatible Series Memory
Model nameLenovo DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K2
Total capacity256 GB (2 × 128 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 items256 GB (2 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How much power does the 1.10V 4Rx4 kit draw when the workstation runs all day?

Each module operates at 1.10 volts; total system power depends on the ThinkStation PX memory controller and workload.

What must the workstation already provide for these 288-pin DDR5 RDIMMs to function?

The ThinkStation PX must support DDR5 4800 registered ECC memory with 4Rx4 organisation and 288-pin slots.

Will the CL40 4Rx4 registered modules run alongside any older DDR5 DIMMs I might keep in the same machine?

Mixing ranks, speeds or latencies can prevent the platform from training; Lenovo recommends identical modules per channel for stability.

More in Model-Specific Memory Upgrades

Similar items