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Four green DDR5 RDIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM MR38400-744K4 512GB (4x128GB) DDR5 4800 CL40 1.1V 4Rx4 ECC RDIMM ASRock TRX50 WS memory upgrade

SKU CH-RZB5-DB81N

512 GB DDR5 4800 CL40 1.1 V ECC registered kit in four 128 GB modules for ASRock TRX50 WS 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

Capacity 512GB 4X128GB

  • 512GB quad-kit scales memory capacity for heavy workloads
  • DDR5 4800 MT/s delivers high throughput for data-intensive tasks
  • CL40 latency at 1.1V balances speed with efficient power use
  • ECC registered design corrects errors to protect critical data
  • Validated for ASRock TRX50 WS ensures reliable compatibility

Capacity and configuration

This kit provides 512GB across four 128GB DDR5 RDIMMs running at 4800 MT/s with CL40 latency. Each module uses a 4Rx4 organisation and operates at 1.10V, delivering registered ECC reliability for the ASRock TRX50 WS workstation platform.

Headroom and limits

The 512GB total fills all four slots on the motherboard, leaving no empty sockets for further expansion without replacing modules. Registered buffering and ECC maintain data integrity under sustained multi-threaded workloads, while the 4800 MT/s speed matches the platform's native memory controller specification.

Build and daily implications

Modules ship without heat spreaders, relying on chassis airflow for cooling in server-oriented enclosures. The 288-pin RDIMM form factor ensures mechanical compatibility with the TRX50 WS DIMM slots, and the registered design reduces electrical load on the memory controller for stable operation at full population.

How it compares

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

Price $16,522.99
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 $32.27 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 lineASRock Server Motherboard Compatible Series Memory
Model nameASRock 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 systemsASRock
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

Other versions of this model

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Questions about this item

Will these four 128 GB DDR5 4800 CL40 RDIMMs run alongside my existing DDR5 ECC registered modules on the ASRock TRX50 WS?

Yes, the kit uses the same DDR5 4800 CL40 1.1 V 4Rx4 registered specification, so it will operate with identical modules already installed in the workstation.

How can I confirm the 512 GB kit is running at DDR5 4800 CL40 with ECC active after installation?

Check the BIOS memory summary or a tool like CPU-Z; it should report 512 GB total, 4800 MT/s speed, CL40 timings, 1.10 V voltage and ECC enabled.

What exactly ships in the MR38400-744K4 box and do I need any extra parts?

The package contains four 128 GB 288-pin DDR5 RDIMMs — 512 GB total — with no heat spreaders included; no additional components are required for installation.

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