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Four green DDR5 RDIMM sticks, no heat spreaders

NEMIX RAM

NEMIX RAM 512GB (4x128GB) DDR5 4800 CL40 ECC RDIMM Lenovo Thinkstation PX memory upgrade

SKU CH-GZ6E-RVB81

512 GB DDR5 ECC registered memory kit in four 128 GB modules running at 4800 MT/s CL40 for Lenovo ThinkStation PX workstations

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 512GB total capacity for memory-intensive workloads
  • DDR5 4800 speed for high-throughput data processing
  • ECC registered design protects data integrity
  • 4Rx4 organisation maximises density per module
  • 1V operation reduces power draw per DIMM

512GB DDR5 4800 ECC RDIMM kit for Lenovo

This kit provides 512GB of DDR5 memory across four 128GB registered DIMMs. It is built for the Lenovo Thinkstation PX workstation platform where ECC and registered operation are required. The modules run at 4800MT/s with a CL40 latency at 1.1V.

Four matched 128GB modules simplify full population

The package contains four identical 288-pin RDIMMs in a single kit, removing the need to source and match individual sticks. Each module uses a 4Rx4 organisation with ECC and registered buffering, so the workstation sees a consistent, validated configuration across all slots.

Handles large in-memory workloads.

The 512GB capacity supports multi-VM hosting, large dataset analytics and high-core-count rendering without swapping. Workloads that demand higher memory bandwidth or lower latency than DDR5 4800 CL40 provides will not benefit from this kit.

How it compares

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

Price $16,910.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $33.03 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 numberMR38400-744K4
Total capacity512 GB (4 × 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 items512 GB (4 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Will the 128 GB modules need any firmware updates or active cooling as they age?

These registered ECC modules have no heat spreader and run at the standard 1.1 V; they rely on the workstation's airflow and require no firmware maintenance.

What limits sustained throughput first — the CL40 latency or the 4800 MT/s data rate?

The DDR5 4800 MT/s clock sets the peak bandwidth ceiling; CL40 latency determines access delay but does not cap maximum throughput.

How much heat and noise do the four 4Rx4 RDIMMs add when the ThinkStation PX runs all day?

Operating at 1.1 V with no onboard fans, the modules add minimal heat; any audible noise comes from the chassis fans responding to total system load.

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