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Four green DDR5 RDIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM 128GB (4x32GB) DDR5 4800 CL40 1.1V ECC RDIMM ASRock WRX90 WS EVO memory upgrade

SKU CH-FZVD-EDN9N

A 128 GB kit of four 32 GB DDR5 4800 CL40 ECC registered DIMMs at 1.1 V, validated for the ASRock WRX90 WS EVO motherboard

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V

Capacity 128GB 4X32GB

Show 3 more
  • 128 GB total capacity with four 32 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered design detects and corrects memory errors
  • Low 1.10 V operation reduces power draw
  • Validated for ASRock WRX90 WS EVO motherboard

ASRock WRX90 WS EVO memory kit

This 128GB kit contains four 32GB DDR5 4800 RDIMM modules built for the ASRock WRX90 WS EVO motherboard. It targets workstation and server builders who need registered ECC memory for stability under sustained loads.

Installation notes and common issues

Modules are 288-pin DDR5 RDIMMs that seat in the board's standard slots; no heat spreader is fitted, so clearance is rarely a problem. The main risk is mixing these registered ECC sticks with unbuffered non-ECC memory, which the platform will not support.

Deciding specification: ECC registered DDR5 4800

The single factor that determines fit is the registered ECC DDR5 4800 specification; the board requires registered ECC modules and will not run unbuffered or non-ECC alternatives. Buyers needing standard desktop memory should look elsewhere.

How it compares

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

Price $3,785.99
Pricier than about 76% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $29.58 per GB
Pricier than about 84% 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 numberMR38400-314K4
Total capacity128 GB (4 × 32 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 rank1Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock
In the box
Included items128 GB (4 × 32 GB) DDR5 4800 MHz PC5-38400 1Rx4 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

How can I verify the 4800 MT/s speed and CL40 latency are active after installing the four 32 GB modules?

Enter the system BIOS or UEFI and confirm the memory frequency reads 4800 MT/s with timings showing CL40; the registered ECC design will also report corrected errors in the OS event logs if it is functioning correctly.

What exactly ships in the MR38400-314K4 kit and are any extra parts required for the ASRock WRX90 WS EVO?

The box contains four 288-pin DDR5 RDIMMs totalling 128 GB; no additional brackets, cables or cooling accessories are needed for installation on the compatible motherboard.

Why choose this 128 GB quad-rank kit over a smaller capacity for the WRX90 WS EVO?

Four 32 GB 1Rx4 modules populate four channels for maximum bandwidth at 4800 MT/s while keeping each DIMM at a single rank, which the platform handles efficiently at the rated 1.1 V.

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