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Four green DDR5 RDIMM sticks without heat spreaders

NEMIX RAM

NEMIX RAM 256GB (4x64GB) DDR5 4800 CL40 ECC RDIMM ASRock W790 WS memory upgrade

SKU CH-9W1R-8GDD2

256 GB kit of four 64 GB DDR5-4800 CL40 ECC registered DIMMs validated for the ASRock W790 WS workstation board

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V

Capacity 256GB 4X64GB

Show 3 more
  • 256 GB total capacity across four 64 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered design detects and corrects data errors
  • Low 1.1 V operating voltage reduces power draw
  • Validated for ASRock W790 WS workstation motherboard

256GB DDR5 4800 ECC RDIMM kit

This 256GB kit contains four 64GB DDR5 4800 registered ECC modules built for the ASRock W790 WS workstation motherboard. It targets IT professionals and system builders who need maximum registered capacity on that specific platform.

Registered ECC modules with major OEM chips

Each module uses 2Rx4 organisation and runs at 1.1V with CL40 latency. The registered buffer and on-die ECC improve signal integrity and data accuracy for sustained server workloads. Samsung Micron or Hynix components are used depending on supply.

DDR5 4800 registered DIMM constraints

The 288-pin RDIMM form factor fits only DDR5 registered slots and will not work in unbuffered consumer boards. Maximum capacity and speed depend on the motherboard memory controller and BIOS revision. Buyers who need unbuffered DIMMs or higher frequencies must choose a different kit.

How it compares

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

Price $7,027.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $27.45 per GB
Pricier than about 76% 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 numberMR38400-924K4
Total capacity256 GB (4 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock
In the box
Included items256 GB (4 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 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

Will the 2Rx4 288-pin RDIMM modules need a heat spreader added later?

The kit ships without a heat spreader; the 1.10 V DDR5 design runs within JEDEC thermal limits, so no aftermarket spreader is required for normal server workloads.

At 4800 MT/s CL40, what bottleneck appears first during continuous heavy compute?

Sustained throughput is capped by the DDR5 4800 data rate and CL40 latency; the memory controller hits its bandwidth ceiling before the 2Rx4 rank structure becomes a limit.

How much power and heat do the four 64 GB sticks generate running 24/7 at 1.1 V?

Four modules at 1.1 V draw modest power typical for registered DDR5; total heat output stays low enough for standard server airflow without extra cooling.

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