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Eight green DDR5 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 128GB (8x16GB) DDR5 4800 ECC RDIMM CL40 1.1V ASRock W790 WS memory upgrade

SKU CH-0A0A-CBN40

128 GB of DDR5 ECC registered memory in eight 16 GB modules running at 4800 MHz CL40 for the ASRock W790 WS workstation

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V

Capacity 128GB 8X16GB

Show 3 more
  • 128 GB capacity with eight 16 GB modules for high-density workloads
  • DDR5 4800 speed delivers 38400 MT/s data rate for fast throughput
  • ECC registered design detects and corrects single-bit errors for data integrity
  • 1 V operation reduces power draw in multi-DIMM configurations
  • Validated for ASRock W790 WS workstation motherboard compatibility

Capacity and compatibility

This kit provides 128GB across eight 16GB DDR5 ECC registered DIMMs validated for the ASRock W790 WS workstation motherboard. It targets IT professionals and builders who need high-density, error-correcting memory for stable server or workstation deployments.

Installation notes

Modules use the standard 288-pin DDR5 RDIMM form factor and operate at 1.1V without a heat spreader, so they fit typical server DIMM slots. Builders must populate all eight channels correctly and verify the motherboard BIOS recognises the full 128GB kit; mismatched population order is the most common cause of a failed POST.

Sustained-load behaviour

Rated at DDR5 4800 with CL40 latency, the modules are stress-tested under continuous load to maintain data integrity in mission-critical environments. The registered buffer and on-die ECC help preserve signal quality during prolonged compute or virtualization workloads, keeping throughput consistent over extended periods.

How it compares

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

Price $3,684.99
Pricier than about 75% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $28.79 per GB
Pricier than about 81% 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 numberMR38400-618K8
Total capacity128 GB (8 × 16 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 rank1Rx8
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock
In the box
Included items128 GB (8 × 16 GB) DDR5 4800 MHz PC5-38400 1Rx8 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 kit runs at DDR5 4800 CL40 after installation?

Check the BIOS or a tool such as CPU-Z; the memory should report 4800 MT/s with CAS latency 40 at 1.10 V.

What exactly ships in the package and is anything else required?

The box contains eight 16 GB DDR5 4800 ECC RDIMM modules for a total of 128 GB; no extra cables or brackets are needed.

Why choose the 8 × 16 GB kit instead of a different capacity?

This kit provides 128 GB across eight registered DIMMs, matching the ASRock W790 WS eight-channel architecture for full bandwidth.

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