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Four green DDR5 RDIMM modules with gold contacts and black chips, no heat spreaders

NEMIX RAM

NEMIX RAM MR38400-744K4 512GB (4×128GB) DDR5 4800 CL40 ECC RDIMM

SKU CH-GK88-P51WN

512 GB quad-channel DDR5-4800 ECC registered memory kit with four 128 GB 4Rx4 modules at 1.1 V and CL40 latency

  • 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

Show 3 more
  • 512 GB total capacity from four 128 GB modules
  • DDR5 4800 speed with PC5-38400 bandwidth
  • ECC registered RDIMM ensures data integrity for servers
  • CL40 latency at 1.1 V for efficient operation
  • 288-pin 4Rx4 design validated for ASRock W790 WS workstation

Capacity and Role

This 512GB kit contains four 128GB DDR5 4800 registered ECC DIMMs. It is built for ASRock W790 workstation boards that require registered memory with error correction. The modules run at 1.1V and carry a CL40 latency rating.

Fit and Limits

The kit suits IT teams deploying high-capacity workstations for virtualisation, large datasets or rendering where registered ECC memory is mandatory. Builds that need unbuffered DIMMs, consumer desktop platforms or motherboards without registered-memory support cannot use these modules.

Sustained Behaviour

All modules are stress-tested under load before shipment to verify stability during extended workloads. Registered buffering and on-die ECC maintain data integrity across long compute sessions without the errors that can accumulate in unbuffered configurations.

How it compares

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

Price $16,652.99
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 $32.53 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

Do I need an ASRock W790 WS motherboard to run this 512GB DDR5 4800 kit?

This kit is validated for the ASRock W790 WS workstation motherboard; other boards may work but are not confirmed by the supplier.

Will these 4Rx4 modules fit alongside my existing 2Rx4 DDR5 RDIMMs?

Mixing 4Rx4 and 2Rx4 ranks is possible only if the motherboard and BIOS support the combined rank population; check the W790 WS manual for approved configurations.

How can I confirm the kit is running at PC5-38400 with ECC active?

In the BIOS or OS memory report verify 4800 MT/s speed, CL40 latency, 1.10 V voltage and that ECC status shows enabled for all four 128GB modules.

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