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

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 4800 ECC RDIMM for ASRock WRX90 WS EVO memory upgrade

SKU CH-JVQB-S7JJ1

A 256 GB DDR5 registered ECC kit with two 128 GB modules at 4800 MT/s, CL40, 1.1 V, 288-pin for ASRock WRX90 WS EVO

  • 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
  • DDR5 4800 speed rated at PC5-38400 for high throughput
  • ECC registered RDIMM design detects and corrects data errors
  • Low 1.10 V operating voltage reduces power draw
  • Validated for ASRock WRX90 WS EVO motherboard compatibility

256GB DDR5 ECC RDIMM kit

This kit supplies 256GB of DDR5 ECC registered memory in two 128GB modules for the ASRock WRX90 WS EVO motherboard. It targets workstations and servers that require error correction and registered signalling for stability under sustained load.

DDR5 4800 registered limits

The modules run at DDR5 4800 (PC5-38400) with CL40 latency at 1.1V and a 4Rx4 organisation. Registered DIMMs add a clock cycle of buffering, so maximum usable speed and total capacity depend on the motherboard memory controller and qualified vendor list.

Check motherboard QVL and CPU support

Verify that the WRX90 WS EVO qualified vendor list includes this part number and that the installed processor supports 256GB of registered ECC memory at the rated speed. Confirm the board has two free 288-pin DDR5 RDIMM slots and that the BIOS is updated to the version recommended for high-capacity registered modules.

How it compares

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

Price $8,340.99
Pricier than about 85% 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 $32.58 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

Should I pick the 256 GB kit or a smaller kit for my ASRock WRX90 WS EVO?

The kit supplies 256 GB as two 128 GB modules. Choose it when your workload needs that capacity and the board has enough DDR5 RDIMM slots.

What does DDR5 4800 mean once the modules are installed?

The memory runs at 4800 MT/s with CL40 latency at 1.10 V, delivering PC5-38400 bandwidth for registered ECC workloads.

How does the 288-pin RDIMM interface limit what I can do?

The 288-pin DDR5 RDIMM form factor fits only DDR5 RDIMM slots and the registered design requires a motherboard that supports registered ECC memory.

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