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Two green DDR5 RDIMM modules, bare chips, no heat spreader

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 4800 CL40 4Rx4 ECC RDIMM memory upgrade for ASRock W790 WS

SKU CH-MKZ7-3TMJB

DDR5 4800 ECC registered RDIMM kit delivers 256 GB in two 128 GB modules with CL40 latency and 1.1 V operation

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V

Capacity 256GB 2X128GB

Show 3 more
  • 256 GB total capacity across two 128 GB modules for large workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive tasks
  • ECC registered design corrects errors to protect critical data
  • 4Rx4 organisation increases density for maximum memory per slot
  • 1 V operation reduces power draw in dense server configurations

Server memory kit for ASRock W790 WS

This 256GB kit delivers 2 x 128GB DDR5 4800 RDIMM modules built for the ASRock W790 WS workstation motherboard. It targets professionals who need maximum registered ECC capacity for memory-intensive server and workstation workloads.

Registered ECC modules require compatible platform

The 288-pin RDIMMs operate at 1.1V with CL40 latency and 4Rx4 organisation, so the motherboard must support registered ECC DDR5 and provide enough DIMM slots for both modules. Using this kit frees the remaining slots for future expansion while keeping the memory subsystem fully buffered.

Sustained load stability through registered design

The registered buffer and on-die ECC maintain data integrity during continuous multi-threaded workloads such as virtualisation, rendering or scientific compute. Stress-tested modules and the 4Rx4 layout help the platform sustain 4800 MT/s throughput without the error accumulation seen in unbuffered configurations.

How it compares

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

Price $8,121.99
Pricier than about 84% 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 $31.73 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 numberMR38400-744K2
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 systemsASRock
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

Other versions of this model

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Questions about this item

How does the CL40 latency affect sustained throughput on this DDR5 4800 kit?

CL40 is the CAS latency at 4800 MT/s; lower latency would improve response time but this is the rated timing for these 4Rx4 modules.

What thermal load should I expect from the 1.10 V registered DIMMs running continuously?

The modules operate at 1.10 V without a heat spreader; registered DDR5 at this voltage typically runs warm but within JEDEC limits for server workloads.

Which motherboard feature must be present for these 288‑pin ECC RDIMMs to function?

The ASRock W790 WS must support DDR5 registered ECC memory with 4Rx4 organisation; the kit is validated for that platform.

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